Tired but can't sleep:
fatigue and sleepiness are not the same thing
It is not a contradiction and it is not in your head. Fatigue and sleepiness are two different states, they are measured with different tools and they can move in opposite directions. In a study of 70 patients with chronic insomnia, people slept significantly less at night than a healthy group and yet, the next day, in the lab test, they took longer to fall asleep than that group did. Your body is not refusing sleep on a whim. It is switched on.
Why you are not sleepy,
even though you are exhausted
“Tired” and “sleepy” sound the same in everyday speech. In the sleep lab they are two separate things, with two separate instruments.
Sleepiness is measured with a test called the multiple sleep latency test. You lie down in bed, in the dark, four or five times over the course of the day, two hours apart, and electrodes time how long it takes you to fall asleep. The faster you fall asleep, the sleepier you are. It is an objective measure of sleep pressure.
Fatigue is measured differently: by how hard it is for you to function, by mood, by memory, by how much effort an ordinary task takes. It has no direct link to how quickly you fall asleep.
And in people with insomnia, the two actually go in opposite directions. In 1988, a team in Detroit compared 70 patients who had come to the clinic for chronic insomnia with 45 people with no sleep complaints. The patients slept significantly less at night. In the authors' exact words, the insomnia group “was found to sleep significantly less than the control group; yet it was also significantly more alert than the control group on the following day, as measured by the multiple sleep latency test”.
Read that sentence once more. They slept less and took longer to fall asleep. In the diagnostic subgroups, the correlation between total sleep time the previous night and the average test score came out at minus 0.67. In other words, among those patients, the less they had slept at night, the harder they found it to fall asleep during the day. The exact opposite of someone who simply stayed up late.
Sleepiness is how quickly you fall asleep when you are allowed to. Fatigue is what it costs you to function. In insomnia, the first is low and the second is high, at the same time. “Tired but can't sleep” is not an exaggeration, it is an accurate description of the state.
This completely changes what you should be looking for. If you were sleepy and could not sleep, the problem would be in your surroundings: light, noise, a child, a mattress. If you are not sleepy at all, the problem is that the system that is supposed to bring you down is switched on. And this is where the second study comes in.
Hyperarousal:
what your body burns extra, non-stop
In 1995, two researchers kept ten people with objectively defined insomnia and ten people without it in the lab for 36 hours, matched one by one for age, sex and weight. They did not just measure their sleep. They measured their whole-body oxygen consumption, in other words their metabolic rate, at intervals, during the day and during the night.
The result: oxygen consumption was raised in the people with insomnia at every measurement point. Not just at night. Not just in the minutes spent awake. The authors removed the night-time periods that contained wakefulness or micro-arousals from the calculation, to be sure they were not simply measuring the fact that the person was awake, and the increase was still there.
And yes, the same thing happened again: the people with insomnia reported more confusion, tension and lack of vigour, they scored worse on memory tests, yet they had significantly raised values on the sleep onset test throughout the assessment. In the authors' words, the differences in mood and performance “were not secondary to sleepiness”.
Their conclusion became the standard model: insomnia is not a sleep deficit, it is a more general disorder of hyperarousal, around the clock. A 2010 review, which brought together autonomic, neuroendocrine, neuroimmunological, electrophysiological and brain imaging studies, arrives at the same place: the level of arousal is raised in primary insomnia both at night and during the day.
How it is measured: the multiple sleep latency test. Four or five sleep attempts over the course of the day, with electrodes, timed.
What it shows in insomnia: raised values, meaning you take longer to fall asleep during the day than someone without sleep problems. Confirmed in 1988, in 70 patients, and in 1995, in the lab group.
What it means for you: if you lie down at 3 pm and do not fall asleep, it is not proof that “there is nothing wrong with you”. It is the classic sign of hyperarousal.
How it is measured: through mood, memory, vigour and the effort an ordinary task takes. Scales filled in by the person, plus performance tests.
What it shows in insomnia: more confusion, tension and lack of vigour, weaker short-term memory. Real, measurable, consistent.
What it means for you: your fatigue is real even if the sleepiness test says otherwise. The two do not contradict each other, they measure different things.
How it is measured: whole-body oxygen consumption, in other words metabolic rate, plus autonomic, endocrine and electrophysiological markers.
What it shows in insomnia: raised at every measurement point over 36 hours, including the night-time stretches with no wakefulness and no micro-arousals.
What it means for you: this is the piece that connects the other two. You are not tired because you do not sleep. Both come from the same place.
There is bad news and good news. The bad news: there is no switch that turns off a system that has been running for months. The good news: if the problem is arousal, then the things that bring it down matter more than any ingredient, and they cannot be bought.
What the law recognises:
fatigue, yes. Sleep, hardly at all
The list of health claims a supplement is allowed to use in the European Union is the annex to Regulation (EU) No 432/2012. It is a single, public document, and we download it in full for every article like this one and read it with the search function. This time it came to 246,268 bytes and 102,123 characters of text.
The document's strength lies not in what it contains, but in what it does not. We counted.
| Word searched | Occurrences | Where |
|---|---|---|
| sleep | 1 | Melatonin, reduction of time taken to fall asleep |
| stress | 8 | All eight mean “oxidative stress”: copper, manganese, olive oil polyphenols, riboflavin, selenium, vitamin C, vitamin E, zinc |
| anxiety | 0 | Nowhere |
| insomnia | 0 | Nowhere |
| relax | 0 | Nowhere |
| cortisol | 0 | Nowhere |
| ashwagandha, Withania | 0 | Nowhere |
Stop for a moment at the stress row. The word appears eight times in the whole list, and eight times out of eight it means oxidative stress, the damage done to cells by free radicals. Chemistry, not a state of mind. None of the eight refers to the stress you feel on a Sunday evening. And the word “cortisol” does not appear at all.
Now the other side. The same annex very clearly recognises the “tired” half. The wording “contributes to the reduction of tiredness and fatigue” exists and is authorised for nine nutrients: folate, vitamin B6, vitamin B12, iron, magnesium, vitamin C, niacin, riboflavin and pantothenic acid. And “contributes to normal psychological function” exists for biotin, folate, magnesium, niacin, thiamin, vitamin B6, vitamin B12 and vitamin C.
The law makes exactly the same split as the lab. The fatigue side is recognised, for nine nutrients, with fixed wording. The sleep side has a single entry in the whole list, it belongs to melatonin, and it refers strictly to how long it takes you to fall asleep. Nothing about what happens after that.
The melatonin claim, as worded in the annex, reads: “Melatonin contributes to the reduction of time taken to fall asleep.” The condition of use, also from the annex: the product must contain 1 mg of melatonin per quantified portion, and the consumer must be informed that the beneficial effect is obtained by consuming 1 mg of melatonin close to bedtime. EFSA Journal 2011;9(6):2241.
There is only one other entry for melatonin, on the alleviation of subjective feelings of jet lag, at a minimum of 0.5 mg, on the first day of travel and on the following few days after arrival. That is the whole list. The rest is marketing, ours included, and below we spell out exactly where.
What you can change tonight,
and what is not worth trying
If the problem is arousal, then the thing with the greatest proven effect is not a supplement. International guidelines recommend, without exception, cognitive behavioural therapy for insomnia as the first-line treatment for chronic insomnia, including in its online form, because it works on both night-time and daytime symptoms. This is not a blogger's opinion, it is the standard recommendation.
Two of its components can be described in a few lines, and one of them directly contradicts what you are doing right now.
You lie down only when you feel sleepy, not at the time you “should”. If you have not fallen asleep within 15 to 20 minutes, you get out of bed and come back only when you feel sleepy, as many times as needed in a night. The bed is used for sleep, not for screens, television or reading. Your wake-up time stays the same every day, and daytime naps are avoided.
You keep a sleep diary for a week and find out how much you actually sleep. Then your time in bed is shortened until it matches that average, not how much you would like to sleep. It sounds harsh and it is, but it builds sleep pressure, and the window widens again, week by week, as your sleep becomes more consolidated. It is done with a specialist, not improvised.
A cool room, no screens, no coffee in the evening. The clinical reference describes it as “minimally effective as a standalone intervention”, although it remains a necessary part of the full package. In other words: it does no harm, but if that is all you have tried, you have tried the weakest part.
A randomised study gave 400 mg of caffeine at three different times: at bedtime, 3 hours before and 6 hours before. All three significantly disrupted sleep compared with placebo, p below 0.05 for all of them. Six hours before bedtime means, for an 11 pm bedtime, a coffee at 5 pm. Which probably seems early to you.
And one thing that does not appear in any guideline, but comes up in every conversation: effort. The harder you try to fall asleep, the more you raise your arousal, which is exactly the variable keeping you awake. Checking the clock and counting the hours left do the same thing. This is not a metaphor, it is the mechanism from chapter 2, switched on by you, for free.
More time in bed with your eyes open lowers sleep pressure and strengthens the link between the bed and being awake. Sleep restriction, a component of the first-line therapy, goes exactly the other way: it shortens the window to how much you actually sleep. Counterintuitive, but it has been done this way for decades.
It is actually the opposite sign. In the 1988 study, patients with chronic insomnia took longer to fall asleep during the day than the healthy group, even though they had slept less at night. Long sleep latency on the daytime test is one of the arguments on which the hyperarousal model was built.
Ashwagandha has no authorised health claim in the European Union, so no manufacturer, ourselves included, has the right to promise you an effect on stress or on sleep. The numbers the studies measured are in the next chapter, and they are not large.
You fall asleep faster and the first half of the night is more consolidated. The second half becomes fragmented, at every dose. We have written about this at length in the article on waking up at 3 am, which also includes the review that measured the effect.
The clinical definition is difficulty falling asleep or staying asleep at least three nights a week, for three months or more, despite adequate opportunity for sleep, with effects during the day. Under strict criteria, prevalence is between 6% and 10%. You can sleep five hours a night and it can be called insomnia, and that does not mean zero sleep.
The numbers on ashwagandha,
and how much of them belongs to the starch
We sell an ashwagandha product and this article is about falling asleep, so we are exactly where a brand ought to show you numbers, not adjectives. There are two randomised studies that directly measured sleep onset latency with actigraphy, in other words with a measuring watch, not with an opinion. We will take them one at a time.
The first, published in Cureus in 2019, took 60 patients with insomnia and anxiety, split them 2 to 1 and gave them, for 10 weeks, either 300 mg of root extract twice a day or an identical starch capsule. The extract was KSM-66, made by Ixoreal Biomed, and the authors thank the company in the paper. That is something worth knowing before any number.
At the end, the difference between the two arms was 4.95 minutes, and yes, it was statistically significant, p equal to 0.019. But look at the other column: the starch group gained 8 minutes on its own, out of the extract group's 12.6. In other words, 63% of the improvement also happened in people taking nothing active.
And there is something else that never gets quoted. For total sleep time, the difference between extract and starch at 10 weeks came out non-significant, p equal to 0.076. For minutes awake during the night, the same, p equal to 0.076. The only significant results were sleep onset latency and sleep efficiency. Nobody slept longer, statistically speaking.
The second study is from 2026, has 200 people and is much more interesting, because it puts the herb head to head with the only thing that has an authorised claim. Four arms of 50 people each, eight weeks: extract 300 mg twice a day, melatonin 3 mg a day, both, or placebo. External funding: none, as declared. Conflicts of interest: none, as declared.
| Arm | Sleep onset, gain at 8 weeks | Total sleep, gain at 8 weeks |
|---|---|---|
| Ashwagandha extract | 14.6 min | 35.9 min |
| Melatonin 3 mg | 16.4 min | 43.5 min |
| Both | 20.9 min | 56.3 min |
| Placebo | 7.2 min | 29.3 min |
Subtract placebo from each row and you are left with what can be attributed. For sleep onset, the extract adds 7.4 minutes over placebo. For total sleep time it adds 6.6 minutes. Six and a bit minutes of extra sleep, after eight weeks of taking something every day.
Melatonin, which has the authorised claim, came out slightly better on both. And placebo alone produced half of the extract's gain in sleep onset and 82% of its gain in total sleep time. Not because people lie, but because an evening ritual, a sleep diary and eight weeks of paying attention to your own rest really do something. The study cannot separate the ritual from the contents of the capsule. Neither can you, at home.
One last thing, and it is the most important for the question in the title: zero studies on the gummy form. Both studies above used capsules. When you see an ashwagandha gummy sold with a reference to “clinical studies”, those studies were done on something else.
What is in our
ashwagandha gummies
The serving is two gummies a day: 600 mg of KSM-66 root extract, standardised to 5% withanolides, with an extraction ratio of 10 to 15 to 1. Sweetened with xylitol, set with citrus pectin instead of gelatine, 60 gummies per jar, which is 30 servings, made in Romania.
What is reasonable to expect, based on the numbers in chapter 5: minutes off the time it takes to fall asleep, not nights turned upside down. In the 2026 study, after eight weeks, the difference from placebo was 7.4 minutes for sleep onset. It is a real, measured number, and it is exactly that much.
If you are tired and cannot fall asleep, the first thing to try is not a supplement, it is what is written in chapter 4. And if your question is strictly about how long it takes you to fall asleep, the best documented ingredient for that is melatonin, 1 mg close to bedtime; we have written about it in the article on waking up at 3 am.
Before anything else: if you are pregnant or breastfeeding, or if you take medication for your thyroid, for blood pressure or for anxiety and depression, read the box in chapter 4 and ask your doctor. Ashwagandha should not be taken on top of just anything.
What our readers
ask us most often
Sources: Regulation (EU) No 432/2012, annex, consolidated text. Stepanski E, Zorick F, Roehrs T, Young D, Roth T, Sleep, 1988. Bonnet MH, Arand DL, Sleep, 1995. Riemann D et al., Sleep Medicine Reviews, 2010. Drake C, Roehrs T, Shambroom J, Roth T, Journal of Clinical Sleep Medicine, 2013. Langade D et al., Cureus, 2019. Langade D et al., Clocks & Sleep, 2026. StatPearls, Chronic Insomnia, NCBI Bookshelf.
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