By Mr Ahmed-Ramadan Sadek, Neurosurgeon · Last reviewed October 2026 · 6 min read

Why sleep matters when your back hurts

If you live with back pain, you probably know the pattern. A bad night leaves you stiff, tired and more sensitive to pain the next day. A painful day makes it harder to settle at night. It can feel like a loop with no way out.

Researchers have looked hard at which comes first. A review of studies from 2005 onwards found that the relationship runs both ways, but with an interesting twist. In studies that followed large groups of people over time, poor sleep reliably predicted new chronic pain and flare-ups of existing pain.^[1] Day-to-day studies suggested that a bad night was a stronger predictor of next-day pain than a painful day was of a bad night.^[1] Experimental work also suggests that disturbed sleep may weaken the body’s own pain-dampening systems.^[1]

That is good news in one sense. Sleep is something you can work on, and improving it may help your pain as well as your energy and mood.

Choosing a mattress

For years people with bad backs were told to sleep on a firm mattress, or even put a board under it. That advice was never based on good evidence.

In 2003 a Spanish trial published in The Lancet tested it properly. It randomly assigned 313 adults with chronic low back pain to a firm or a medium-firm mattress, without either the patients or the assessors knowing which was which.^[2] After 90 days, the people on medium-firm mattresses had less pain in bed and less disability than those on firm mattresses.^[2]

Later systematic reviews have reached a similar conclusion: a medium-firm mattress, or one that can be adjusted to your own comfort, seems to give the best balance of comfort, sleep quality and spinal alignment.^[3][4] The trials vary in quality and in how they define “firm”, so treat this as a sensible guide rather than a precise prescription.

Practical mattress tips

• If you can, try before you buy, and lie in your usual sleeping position for at least several minutes.
• Look for a long home trial period. It can take a few weeks to know whether a mattress suits you.
• An expensive “orthopaedic” label is not a guarantee of anything. Comfort and support matter more than marketing.
• If a new mattress is not affordable, a good quality mattress topper can make a sagging or overly hard bed more comfortable.
• Very soft or badly sagging mattresses can leave you sinking in one position. If yours has a dip in the middle, it may be time to replace it.

Sleeping positions

You will find plenty of confident advice online about the “best” position for back pain. In truth there is very little high-quality research on this, and most of it is based on comfort and common sense rather than trials. The best position is the one that lets you sleep comfortably. These adjustments help many people:

• On your side: bend your knees slightly and put a pillow between them, so your top leg does not pull your lower back round. Use a pillow that keeps your neck level with the rest of your spine.
• On your back: a pillow under your knees can take some strain off the lower back.
• On your front: many people with neck or back pain find this harder, because your head is turned to one side. A flat pillow, or a thin pillow under your hips, may help.
• Getting out of bed: roll onto your side, drop your legs over the edge and push up with your arms. This is often easier when your back is sore.

Treating insomnia: CBT-I

Insomnia means regularly finding it hard to get to sleep or stay asleep, waking too early, or still feeling tired after sleep.^[5] Low back pain is recognised as one of the main causes of poor sleep quality.^[4]

If changing your habits is not enough, your GP may offer a talking therapy called cognitive behavioural therapy for insomnia, or CBT-I. It helps you change the thoughts and behaviours that keep you from sleeping, and can be done face to face with a therapist or through an online self-help programme.^[5]

A meta-analysis of 12 trials, including 762 people with chronic pain and insomnia, found that CBT-I clearly improved sleep straight after treatment and that the benefit lasted at follow-up of up to a year.^[6] It also produced a small improvement in pain and in low mood after treatment.^[6] In other words, it is mainly a treatment for sleep, but better sleep may take the edge off pain too.

Simple habits that help

Most of these come from NHS advice on insomnia.^[5] None is a quick fix, but together they make a difference.

• Get up at the same time every day, including weekends, even after a bad night.
• Only go to bed when you feel sleepy.
• Give yourself an hour to wind down before bed. A warm bath, reading or gentle stretching can help.
• Keep your bedroom dark, quiet and at a comfortable temperature.
• Avoid caffeine, alcohol and smoking in the six hours before bed, and avoid a large meal late at night.
• Be active during the day, but avoid hard exercise in the four hours before bed.
• Put screens away before bed.
• Try not to nap in the day.
• If you take painkillers, ask your GP or pharmacist whether timing a dose before bed makes sense for you.

When to see your GP

See your GP if changing your habits has not helped, if you have had trouble sleeping for months, or if poor sleep is making it hard to cope day to day.^[5] Mention your back pain too, because better pain control may help your sleep and vice versa. Loud snoring with pauses in breathing, or falling asleep during the day without meaning to, can be signs of sleep apnoea, and your GP may refer you to a sleep clinic.^[5]

Pain that wakes you every night, whatever position you are in, is worth mentioning to a doctor, especially if it is new or getting worse.

References

1. Finan PH, et al. The association of sleep and pain: an update and a path forward. J Pain. 2013;14(12):1539-52. Link
2. Kovacs FM, et al. Effect of firmness of mattress on chronic non-specific low-back pain: randomised, double-blind, controlled, multicentre trial. Lancet. 2003;362(9396):1599-604. Link
3. Radwan A, et al. Effect of different mattress designs on promoting sleep quality, pain reduction, and spinal alignment in adults with or without back pain; systematic review of controlled trials. Sleep Health. 2015;1(4):257-267. Link
4. Caggiari G, et al. What type of mattress should be chosen to avoid back pain and improve sleep quality? Review of the literature. J Orthop Traumatol. 2021;22(1):51. Link
5. NHS. Insomnia. NHS website. Link
6. Selvanathan J, et al. Cognitive behavioral therapy for insomnia in patients with chronic pain: a systematic review and meta-analysis of randomized controlled trials. Sleep Med Rev. 2021;60:101460. Link

This guide is general information and is not a substitute for advice about your own situation. Please speak to your GP, physiotherapist or specialist before starting a new treatment.