Why Does My Body Feel Restless When I Try to Sleep?

Quick answer: if you feel tired but your body feels restless, uncomfortable or jittery when you try to sleep, something is usually keeping your body or nervous system switched on. The most common reasons are caffeine or stress, a bedroom that is too warm, pain or an uncomfortable bed, and restless legs syndrome (RLS). If the main feeling is a strong urge to move your legs that is worse in the evening and eases when you move, that points to RLS, which is worth raising with a doctor.

Who This Is For

You feel tired, but your body won’t settle once you lie down
You keep shifting position because nothing feels comfortable
You feel jittery, wired or buzzy at night even though you’re exhausted
Your legs feel odd or you can’t keep them still in bed
You toss and turn through the night and wake up feeling you barely rested

Quick Fix / Summary

Run the legs, mind or bed self-check below to narrow down the cause
Stop tea, coffee and other caffeine at least 6 hours before bed (8 if you are sensitive)
Give yourself an hour to wind down, away from work and screens
Cool the bedroom and check your mattress, pillow and bedding
If your legs are the problem, try walking, stretching or a warm bath, and see a GP if it keeps happening
If you are still awake and restless after about 20 minutes, get up and do something calm in dim light

Is It Your Legs, Your Mind or Your Bed? A Quick Self-Check

“Restless” can mean very different things. Use this table to work out which pattern sounds most like you, then jump to that section.

	What it feels like	Typical clues	Start with
Your legs	An urge to move your legs, often with crawling, tingling, aching or throbbing feelings	Worse when you sit or lie still in the evening; moving or walking gives brief relief	The restless legs section below, and a GP visit if it happens often
Your mind	Wired, jittery or “on”, even though your body is tired	Caffeine late in the day, a stressful evening, work or screens close to bed	Caffeine timing and a proper wind-down
Your bed	Hot, sticky or unable to find a comfortable position	Better in a cooler room or a different bed; pressure points, a sore neck or back	Room temperature, bedding and sleeping position
Your body	Pain, heartburn or a sour taste that stops you settling	Worse lying down or after a late meal	The pain and reflux section below

More than one row can apply. Caffeine, for example, can make restless legs worse as well as keeping your mind busy, so it is worth working through each one.

Tired but Restless: Why the Two Can Happen Together

Being tired and being able to switch off are not the same thing. You can have a big need for sleep and still lie in bed with a body that won’t settle, because the things that keep you alert (caffeine, stress, a hot room, discomfort) don’t disappear just because you are worn out.

The NHS lists the common causes of insomnia as stress, anxiety or depression, noise, a room that is too hot or cold, uncomfortable beds, alcohol, caffeine or nicotine, recreational drugs, jet lag and shift work. Several of those act on your body as much as your mind, which is why bedtime restlessness often feels physical.

If your mind is the louder part of the problem and your thoughts keep running, an overactive brain at night covers that side in more detail.

Is It Your Legs? Signs of Restless Legs Syndrome

Restless legs syndrome is a neurological condition that causes an irresistible urge to move the legs, according to the National Institute of Neurological Disorders and Stroke (NINDS). People describe the feelings that come with it as aching, throbbing, pulling, itching, crawling or creeping. NINDS describes RLS as a sleep disorder triggered by resting and attempting to sleep, which is exactly why it shows up at bedtime.

Signs that point towards RLS rather than general restlessness:

The urge is mainly in your legs, not your whole body
It starts when you are sitting or lying still for a while
It is worse in the late afternoon, evening or night
Moving, walking or stretching relieves it, but it returns soon after you stop

NINDS lists several things linked to RLS: low iron, pregnancy (especially the third trimester), kidney failure, and some medicines, including some anti-nausea drugs, antipsychotics, antidepressants that increase serotonin and some antihistamines. There is no single test for RLS, but blood tests can rule out causes such as low iron or kidney problems.

For self-help, the NHS page on restless legs syndrome suggests exercising during the day, avoiding caffeine after midday, and applying heat to your legs or massaging them before bed. Our full guide to restless legs syndrome symptoms and relief covers iron testing, treatment and how RLS differs from twitching during sleep.

Jittery or Wired at Night: Caffeine, Stress and Screens

If your body feels buzzy rather than achy, the cause is usually something that is keeping you alert.

Caffeine later than you think

The NHS advises not drinking tea or coffee, smoking or drinking alcohol for at least 6 hours before bed, and Mayo Clinic suggests no caffeine after noon if you struggle to sleep. The Sleep Foundation goes further and suggests at least 8 hours, so treat 6 hours as the minimum. That includes energy drinks, cola, some pre-workout products and strong green tea. If an afternoon coffee is part of your routine, how long caffeine keeps affecting sleep explains why a 3pm cup can still matter at 11pm.

Stress and a busy evening

A stressful day, an argument or late-night work can leave your body tense and your breathing quick and shallow. The NHS recommends relaxing for at least an hour before bed, for example with a bath or a book. Many people also find slow breathing with a longer out-breath than in-breath helps their body settle.

If you feel exhausted all day and suddenly alert at night, that pattern is covered in why you feel wired at night but tired during the day.

Going to bed before your body is ready

Lying in bed when you are not yet sleepy is a recipe for fidgeting. The NHS advice is to go to bed only when you feel sleepy and to get up at the same time every day. If your sleep times drift later and later, fixing your sleep schedule walks through how to bring them back.

Restlessness can also be situational. New parents dealing with postpartum sleep deprivation often feel wired and unable to settle even when they finally get a chance to sleep.

Too Hot, or Just Can’t Get Comfortable

Sometimes the restlessness is your body telling you the setup is wrong. The NHS lists a room that is too hot or cold and an uncomfortable bed among the common causes of poor sleep.

Clues it’s your bed or bedroom:

You kick the covers off, then pull them back on
You sleep better in a cooler room or a different bed
You wake with a sore neck, shoulders or back
You can’t find a position that feels right for more than a few minutes

What to try:

Cool the room and use lighter, breathable bedding
Check that your pillow keeps your neck level with your spine
Look at the mattress if you wake with pressure points or aches

If heat is the main issue, why you feel too hot to fall asleep covers the causes and fixes. For position, see which sleeping position actually suits you. Some people find the steady pressure of a weighted blanket helps them settle, but treat it as a comfort choice rather than a treatment, and it won’t fix restless legs.

Pain, Reflux and Other Physical Reasons

Physical symptoms that are worse lying down can make it impossible to settle. Heartburn and acid reflux are a common one: the NHS notes that symptoms are often worse after eating, when lying down and when bending over. Its advice is to avoid eating within 3 or 4 hours of bed, eat smaller meals and raise the head of the bed by 10 to 20cm. Our guide to why reflux gets worse at night explains more.

Ongoing pain in your back, hips, shoulders or joints can also keep you shifting all night. If pain is regularly stopping you sleeping, it is worth talking to a GP or physiotherapist rather than just changing pillows.

Hunger, or a sugary snack late in the evening, is sometimes blamed for feeling jittery at night. For people without diabetes, the evidence that blood sugar swings cause bedtime restlessness is limited, so treat it as something to test rather than a likely cause. How blood sugar affects sleep covers what is and isn’t known.

Finally, check your medicines. Some antihistamines, anti-nausea drugs and antidepressants can make restless legs worse, according to NINDS. Don’t stop a prescribed medicine on your own, but do mention the timing to your doctor or pharmacist.

Restless Sleep: When You Toss and Turn All Night

Restless sleep is slightly different from restlessness at bedtime. It means you fall asleep but move a lot, wake often or feel you never sleep deeply. Many of the same causes apply, especially heat, alcohol, caffeine and stress, but a few are specific to the night.

Leg movements during sleep: NINDS notes that most people with RLS also have involuntary leg twitching while asleep, which a partner may notice before you do
Breathing problems: loud snoring, gasping or choking noises and waking a lot are symptoms of sleep apnoea, according to the NHS. If that sounds familiar, read what sleep apnea is and when to see a doctor
Alcohol: the NHS lists alcohol among common causes of insomnia, and many people notice more broken sleep after an evening of drinking
Waking up restless: if you sleep at first but wake up later feeling unsettled, why you wake up at night feeling restless covers that pattern

What to Do Tonight

Name the type. Legs, mind, bed or body: pick the row in the self-check table that fits best.
If it’s your legs, get up and walk, stretch or massage your calves, or try a warm bath or heat pad before bed.
If it’s your mind, stop trying to force sleep. Breathe slowly with a longer out-breath and let your body relax first.
If it’s your bed, cool the room, change a layer of bedding or try a different position.
If you’re still restless after about 20 minutes, get up, sit somewhere dim and do something calm until you feel sleepy. Mayo Clinic gives the same 20-minute advice for night waking, and it stops your bed becoming a place where you lie awake and frustrated.
Keep tomorrow’s wake time the same, even after a bad night, so the next night is easier.

Common Mistakes to Avoid

Trying to force sleep: the effort itself keeps you tense
Scrolling in bed: it keeps your mind engaged when you want it to slow down
Ignoring an urge to move your legs: RLS is a medical condition with treatable causes, not just fidgeting
Starting iron tablets without a blood test: low iron is linked to RLS, but check your levels with a doctor first
Changing everything at once: change one thing at a time so you know what actually helped

When Restlessness Needs a Doctor

Occasional restless nights are common and usually settle with the changes above. Book a GP appointment if:

An urge to move your legs is stopping you sleeping, affecting your mood, or not improving with self-help (NHS advice for RLS)
Restless legs started during pregnancy, after a new medicine, or alongside kidney problems or tiredness that could suggest low iron
Changing your sleep habits hasn’t helped, or the problem has gone on for months and is affecting your daily life (NHS advice for insomnia)
You snore loudly, make gasping or choking noises, or a partner has noticed your breathing stop
You have heartburn most days, food gets stuck when you swallow, or you are losing weight without trying

If trouble sleeping happens at least three nights a week for three months or more, the American Academy of Sleep Medicine describes that as chronic insomnia, and it recommends cognitive behavioral therapy for insomnia (CBT-I) to treat it. CBT-I and how it works explains what is involved.

Get urgent help if restlessness comes with chest pain, breathlessness, or a racing heart that doesn’t settle.

FAQ

Why do I feel tired but restless when I try to sleep?

Because being tired and being able to switch off are different. Caffeine, stress, a hot room, an uncomfortable bed, pain and restless legs syndrome can all keep your body alert even when you badly need sleep. Working out whether it is your legs, your mind, your bed or another physical symptom tells you which fix to try first.

Why do I feel jittery at night?

The most common reasons are caffeine too late in the day, stress or a busy evening, and going to bed before you feel sleepy. The NHS advises avoiding tea and coffee for at least 6 hours before bed and taking an hour to relax first. If the jittery feeling is mainly an urge to move your legs, consider restless legs syndrome.

How can I tell if it’s restless legs syndrome or just restlessness?

Restless legs syndrome is an urge to move your legs, often with crawling, tingling or aching feelings, that starts when you are still, is worse in the evening and eases briefly when you move. General restlessness is more of a whole-body or mental inability to settle. If the leg pattern fits and happens often, see a GP.

Can low iron make you restless at night?

It can play a part. NINDS lists iron deficiency as one of the factors linked to restless legs syndrome, and the NHS lists iron deficiency anaemia as a cause. A doctor can check your iron with a blood test. Don’t start iron supplements without testing first.

How long should I stay in bed if I can’t settle?

About 20 minutes. If you are still restless after that, get up, sit somewhere dim and do something calm, then go back to bed when you feel sleepy. Mayo Clinic gives the same 20-minute advice for waking in the night.

Key Takeaways

Feeling restless or uncomfortable when you try to sleep usually means something is keeping your body switched on, even though you are tired. Work out whether it is your legs, your mind, your bed or another physical symptom. Cut caffeine earlier, wind down properly, cool the room and fix your setup. An urge to move your legs that is worse in the evening and eases with movement suggests restless legs syndrome, which is worth checking with a GP, including an iron test.

About this article

Written by the Sleep Fixes editorial team. We’re not medical professionals. We research each topic against primary sources and hold ourselves to being critical and thorough about what actually makes it onto the site.

This article is part of Sleep Fixes, a site focused on practical, easy-to-follow solutions for common sleep problems like night waking, dry mouth, overheating, and disrupted sleep.

The facts on restless legs syndrome in this article come from NINDS and the NHS. Sleep habit advice comes from the NHS, Mayo Clinic and the American Academy of Sleep Medicine. It is not medical advice. If your symptoms are severe, persistent, or worsening, consider consulting a qualified healthcare professional.

Why Does My Body Feel Restless or Uncomfortable When I Try to Sleep?