Being tired and being ready to sleep are not the same thing. Your body has a sleep drive that builds up the longer you're awake, a body clock that decides when you feel sleepy, and an alert system that stress can switch on. When the clock isn't ready yet, or the alert system is still running, you can lie in bed exhausted and wide awake. What helps tonight is to stop fighting it: dim the lights, do something calm, and get up if you're still awake after about 20 minutes. What helps in the long run is a fixed wake-up time and fewer things that keep your body on alert in the evening.
If you're lying awake right now, our guide can't sleep? what to do right now has five steps for the next 20 minutes. This page explains why it happens and what you can change.
Why you can be tired but not sleepy
The US National Institute of Neurological Disorders and Stroke (NINDS) describes two systems that work together to decide when you sleep:
- The sleep drive. It "gets stronger every hour you are awake." NINDS explains that the release of a chemical called adenosine helps make you feel sleepy, and that caffeine counteracts sleepiness by blocking adenosine.
- The body clock. Circadian rhythms "cause you to be sleepy at night and can help you wake up in the morning," and are matched to light and dark partly through the hormone melatonin.
When both line up, you get sleepy at your usual time. When they don't, you can feel drained after a long day while your clock still says "not yet". NINDS gives shift work and jet lag as examples where the internal clock and the actual clock don't match.
Then there's the third factor: alertness. The NHS explains that when you feel stressed or anxious, "your body may feel more alert. Your mind may also be full of worrying thoughts." Researchers who study insomnia describe a state of "hyperarousal": a 2010 review in Sleep Medicine Reviews summarized evidence that people with insomnia show increased levels of arousal both at night and during the day. That's the scientific version of "tired but wired".
Three common patterns, and what to try
Which one sounds like you?
1. Tired but wired: your alert system is still on
What you notice: heavy eyes, but a busy head, a quick heartbeat or a restless body. Often after a stressful day, late coffee, a late workout, or an evening on your phone.
What to try: move the last coffee earlier (the NHS says no tea or coffee at least 6 hours before bed), finish exercise at least 4 hours before bed (NHS), and give the last hour to something calm without screens. If stress is behind it, our guide on how to sleep when you're stressed has an evening plan and a 3-minute downshift.
2. Tired, but your body clock says "not yet"
What you notice: you went to bed earlier than usual because you felt exhausted, or your sleep times move around a lot, for example late weekends and early weekdays.
What to try: go to bed when you feel sleepy, not just tired, and get up at the same time every day, weekends included. Both are on the NHS's self-help list for insomnia. Daylight during the day helps too: the Sleep Foundation calls light, especially sunlight, "one of the key drivers of circadian rhythms." Our sleep hygiene checklist has the full list.
3. Tired, and something keeps disturbing your sleep
What you notice: you fall asleep but keep waking, or your body won't let you rest: pain, needing the toilet, feeling hot, restless legs, or someone tells you that you snore or stop breathing.
What to try: this is where habits reach their limit. The NHS lists restless legs syndrome, an overactive thyroid, long-term pain and sleep apnea among the conditions that can cause insomnia, and notes that many medicines can too. Talk to a doctor (more below).
What to do tonight when you're tired but can't sleep
- Stop trying to sleep. The NHS suggests not forcing it: "When you're comfortable and resting, you may find you fall asleep naturally."
- Keep the light low and the clock out of view. Checking the time makes you count the hours you have left.
- Try the short rest exercise below, which asks nothing of you except to notice how heavy you already feel.
- If you're still awake after about 20 minutes, get up. Sit somewhere comfortable and do something calm, like reading or listening to quiet music. Go back when you feel sleepy. The NHS, the AASM and the Sleep Foundation all give this advice.
- Get up at your usual time tomorrow, even after a bad night. The NHS advises not to sleep in. The sleep drive you build up during the day is what helps you sleep the next night.
A 2-minute rest for an overtired body (script)
We wrote this for nights when you're exhausted but can't drop off. It doesn't try to make you sleep. Go through it in your mind.
Let your eyes close. You don't have to fall asleep. You only have to rest. Notice how heavy you already are. The tiredness is real. Let it be heavy. Feel your head sinking into the pillow. Your shoulders into the mattress. Your legs, heavy and still. Breathe out a little longer than you breathe in. Once. Twice. Then let the breath do what it wants. If a thought says "I need to sleep now," answer it: "I'm resting. That's enough for now." Stay with the heaviness. Nothing to fix tonight.
Tired but can't sleep at night, or through the night
Some people fall asleep quickly because they're so tired, then wake up at 2 or 3 and can't get back to sleep. That's a slightly different problem. Our guides on how to stay asleep and how to fall back asleep cover it step by step.
Tired but can't sleep during the day
Not being able to nap despite exhaustion is common, and the NHS lists it among the signs of insomnia: you "find it hard to nap during the day even though you're tired." The alert state doesn't switch off just because it's daytime. Don't force a nap. If you do lie down, keep it short and early: an AASM handout suggests under 1 hour and never after 3 p.m., while the NHS self-help list for insomnia says not to nap at all. If you're so tired during the day that it affects your daily life, the NHS suggests seeing a GP (more below).
Tired but can't sleep because of anxiety
If worry is what keeps you up, the tiredness makes it worse: thoughts feel bigger at night, and every hour awake adds to the worry about tomorrow. Two guides help here: can't sleep because of racing thoughts has a 4-minute wind-down and the NHS "worry time" method, and how to sleep when you're stressed shows how to close the day on paper. If anxiety stays with you most days for weeks, talk to a doctor.
Sessions for tired nights in the app
If you'd rather be talked through it, AI Meditation: Sleep & Calm has a session made for exactly this: Falling Asleep Despite a Racing Mind is for nights when you're actually tired, but thoughts keep starting up, with a simple sequence of feeling contact, letting go and kindly unhooking from thoughts. Falling Asleep Gently: Settling In, Letting Go is the all-round evening session, with a longer exhale, a calming body scan and optional muscle relaxation. For waking up in the night there's Gently Drifting Back to Sleep, with simple words, long pauses and gentle breathing.
If a voice is too much, the app also has white, pink and brown noise with a timer that fades out. You can adjust how long a session lasts within its range, and the voices are AI voices. See how the app works, try it for free, no account needed.
When being tired but unable to sleep needs a doctor
A few nights like this are normal. The NHS suggests seeing a GP if:
- "you've been feeling tired for a few weeks and you're not sure why"
- "your tiredness affects your daily life"
- you feel tired and have other symptoms, "such as weight loss or mood changes," or you've been told you make gasping, snorting or choking noises while asleep
For insomnia, the NHS adds: if changing your sleeping habits hasn't helped, if you've had trouble sleeping for months, or if it's affecting your daily life in a way that makes it hard to cope.
The NHS page on tiredness lists conditions a GP may check for. One of them fits "tired but wired" closely: an overactive thyroid can come with being "tired all the time, finding it hard to stay still, feeling nervous, anxious and irritable." Others include sleep apnea, anemia and diabetes. The NHS also advises not to self-diagnose, and to see a GP if you're worried. A doctor can find out whether there's a cause that needs treating.
Your health
This app is a wellness app and does not replace medical advice. If sleep problems or tiredness last for weeks or affect your day, talk to a doctor. The NHS insomnia page explains when to see a GP and what treatment can look like.
Sources
All pages accessed on September 25, 2026.
- NINDS: Brain Basics: Understanding Sleep (last reviewed February 25, 2025). Sleep drive and circadian rhythm, adenosine and caffeine, shift work and jet lag.
- Riemann D et al.: The hyperarousal model of insomnia: a review of the concept and its evidence. Sleep Medicine Reviews 2010;14(1):19-31.
- NHS: Insomnia (page last reviewed March 19, 2024). Signs including trouble napping, causes, self-help, when to see a GP.
- NHS: Tiredness and fatigue (page last reviewed June 2, 2023). When to see a GP, conditions that can cause tiredness.
- NHS Every Mind Matters: Sleep problems. Stress and alertness.
- NHS Every Mind Matters: How to fall asleep faster and sleep better. Not forcing sleep, clocks out of view, the 20-minute rule.
- AASM: How to sleep better (PDF handout, 2012). Naps under 1 hour, not after 3 p.m.
- Sleep Foundation: Sleep Hygiene (updated July 7, 2025). Daylight and circadian rhythm, the 20-minute rule.
