Back pain, sleep and stress: why bad nights turn it up

Bad nights and heavy weeks tend to go with louder backs. Studies show a link, not a cause, and the effects are small, but they explain why a back can flare with nothing lifted. What you can do: after a poor night, move gently before you judge the day; give your nights a steady shape where you have a say; and on a heavy week, keep a smaller day instead of stopping.

Victor Cardoso has heard the question many times. On episode 181 of the Lutz Podcast, a Brazilian show, the host asked whether there was a way to avoid ending up with back pain. Cardoso, a physiotherapist who sees patients and posts free exercise videos, answered with an image: "Eu gosto de dizer que toda dor é como se fosse um copo… Vai enchendo. Quando transborda, dói." ("I like to say that all pain is like a glass… It fills up. When it overflows, it hurts.") (Lutz Podcast, 2023, 39:12 to 39:21).

Cardoso's example is someone who sleeps badly, eats poorly, exercises on and off and is under a lot of stress, then decides one day to put more weight on a squat and blames the squat when it hurts. "Olha o resto da garrafa": look at the rest of the bottle (39:45).

The glass is Cardoso's metaphor, not a finding, but the research on sleep and work points the same way. Below: what those studies found and don't show, how to tell a stiff morning from a sign worth checking, and what to do the morning after and in a heavy week.

What do sleep and stress have to do with a sore back?

1. A worse night goes with a louder morning

The clearest study followed people through ordinary days. In a 2017 diary study, 105 adults in the US with low back pain that had lasted at least six months rated their sleep, pain, mood and function on an electronic diary five times a day for 14 days. When someone slept worse than usual, their pain tended to be higher the next day, and the link was strongest in the morning (Gerhart et al., 2017).

Two details make it more useful. First, the effects were small: the authors estimate that night-to-night swings in sleep accounted for about one percent of the variation in the next day's ratings. Second, a good night helped mostly early on. People had relatively good mornings after a better night, but by the end of the day their pain was much like that of people who'd slept badly. The authors' words: "A good night's sleep also appears to offer only temporary respite." The reverse path, a painful day leading to a worse night, was mostly not found in their data.

A 2013 review of the wider research came to a similar reading: sleep problems predicted later pain more reliably than pain predicted sleep problems, and small lab studies suggest that poor sleep may weaken the body's own pain control (Finan et al., 2013). Those lab studies are small, and many were in people without back pain.

Over longer spans, the evidence is thinner. A 2018 review of 16 studies that followed 61,100 people found that worsening sleep went with later pain problems. Only one was about back pain: in 2,131 working adults in Israel followed for 3.7 years, those whose insomnia symptoms got worse were more likely to have a back pain diagnosis later (an odds ratio of 1.40) (Afolalu et al., 2018). One cohort, one direction, no proof of cause.

2. The heavy week shows up too

Work pressure has the same shape. A 2019 review pooled 18 studies of 19,572 working adults and looked at long-lasting low back pain, meaning three months or more. A heavy workload went with about 1.3 times the odds of it. Having control over your work went with lower odds (0.81), decision authority lower still (0.72), and support from colleagues or a supervisor lower too (0.75 to 0.78). The pattern held in the studies that followed workers forward in time (workload 1.25) (Buruck et al., 2019). All the work measures were self-reported, and the outcome was long-lasting pain, not every sore day.

That's why "stress" is a slippery word here. What the studies measured was how much the job asks, how much say you have and how much support you get. A heavy week isn't only about hours.

3. What this doesn't mean

It doesn't mean stress or poor sleep causes back pain, and it doesn't mean the pain is imagined. Peter O'Sullivan, a specialist musculoskeletal physiotherapist and professor at Curtin University in Australia, who co-developed cognitive functional therapy, an approach for disabling back pain that he teaches to clinicians, explains in a 2015 lecture video that the causes of back pain are "a lot more complex" than structure alone. He lists high stress and not sleeping among the things that can turn up what he calls "the amplifier" (Evoolve Pain Care Academy, 2015, 5:23 and 6:42 to 6:57).

The World Health Organization's fact sheet on low back pain lists "getting good sleep" among the parts of self-care, alongside staying active (WHO, 2023). So steadier sleep is worth having for its own sake. Nobody has shown that it treats back pain.

Why is my back worse in the morning?

Plenty of people wake stiff and sore and loosen up as they move, and the diary study suggests a poor night makes that morning louder. That's the common pattern, and it's what the rest of this article is about.

Pain that behaves differently deserves a different response. The 1h Protocol to Manage Back Pain treats pain that is worse at night, or doesn't change at all when you move or rest, as a reason to see a doctor before you start. Serious causes of back pain are rare, and these signs are a reason to get checked, not a sign that something is wrong. Here they are in the program's own words.

[!WARNING] Most flares pass, but a few signs mean more. If any start, get help: Get medical help straight away

• Trouble peeing, or leaking pee or poo without meaning to
• Numbness around your genitals or bottom, or sex feeling different
• Both legs weak, numb or tingly, or you can't walk because of the pain
• Pain after a serious fall, accident or blow
• Chest pain or trouble breathing with it; or new pain far worse than before, or getting worse fast

See a doctor first

• A fever, or feeling hot, shivery or unwell
• Cancer in the past, or weight lost without trying
• Pain worse at night or unchanged by moving or resting; high between the shoulder blades; one leg weak or numb

If a new flare isn't getting better after a few weeks, keeps getting worse, or worries you, see a doctor.

What to do after a bad night, and in a heavy week

Cardoso's point about the glass is that it "nunca vai estar vazio" (will never be empty, 39:49): there will always be a poor night or a day that goes wrong. As long as it isn't full to overflowing, Cardoso goes on, there's room to ask a bit more of your body (around 40:05). The steps below are about the parts you can reach.

4. Move first, then decide

After a poor night, the usual move is to lie there, feel how stiff and loud your back is, and write the day off before it starts. The program's first step for people whose bad days follow poor nights turns that round: "After a poor night, get up and move gently before deciding how the day will go." Use the first five minutes after you get up, before the phone. If you're very stiff, start smaller, and decide after.

In practice: a few slow steps, the kettle on, a warm shower, and only then the question of how big today can be. The diary study's mornings are why this moment matters; that moving first changes the day's pain is the program's reading, not a finding.

5. Give your nights a steady shape where you have a say

The program's nights line is "keep a steady wind-down and wake time". Pick one cue that tells your body the day is closing, such as the same lamp, a warm drink, a book, some music or a shower, and keep it in the same place. Keep the wake time about the same, days off included, because it's the part you can usually hold.

Some nights aren't yours to plan: a baby, a parent who calls, a shift that changes. Then keep one fixed point, the same wake time after your main sleep, and let the rest go. Our sleep guides go further: how to sleep better and why a fixed wake time helps.

6. On a heavy week, keep a smaller day, never none

When the week is already heavy, moving feels like one more job, and it's the first thing dropped. Australia's clinical care standard for low back pain tells patients not to wait for all the pain to be gone before moving, and says that staying active and continuing daily activities as normally as possible, work included, "leads to the most rapid and complete recovery" (ACSQHC, 2022). The program applies that to the heavy week in its own way, which it labels a starting point, not a tested rule: your walk shrinks before it stops. Half of it, one call taken walking, or the last stop home on foot.

7. Check the day the next morning

One more habit ties the steps together. Next morning, ask one question: is my back no worse than yesterday morning? A yes means yesterday was the right size. A no means ease off a little and build back from where you are, never from the start. Over two weeks, the marks show you what size of day your back can take, including after the poor nights.

Back to the glass

Cardoso's glass never empties, and the studies agree in their own way: sleep and work pressure go with how loud a back feels, by small amounts. The useful part is the margin. A poor night is a reason to start the day differently.

To build this around your own days, try the 1h Protocol to Manage Back Pain, a program of practical education. Its free first chapter starts with a quick check for warning signs, then a few short questions about how your back days go. Your answers point to one of four patterns, or the Tune-up. One of them is the Volume Knob, where bad days follow a poor night or a heavy week, and you get one thing to do tomorrow. The full program takes about an hour and walks one back day with you at your own times, then plans a flare, the days after it, and the days that don't go to plan. You leave with two or three things to start now, each with an alternative for harder days, a flare card for your lock screen, and fourteen days to try it, with a sheet, reviews on days 7, 14 and 30, and four one-tap check-ins by email if you're signed in. It's new, so there's no outcome data on it yet. Start free

Frequently asked questions

Can stress cause back pain?

No study shows that stress causes it. In a review of 18 studies of 19,572 workers, a heavy workload went with more long-lasting low back pain, and control over your work and support at work went with less (Buruck et al., 2019). That's a link, and the pain is real either way.

Why is my back worse after a bad night?

In a diary study of 105 adults with long-lasting back pain, pain tended to be higher the day after a worse night, most of all in the morning, though the effects were small (Gerhart et al., 2017). Get up and move gently for a few minutes before you decide how the day will go.

Why does my back hurt in the morning?

Many people wake stiff and loosen up as they move, and a poor night can make that morning louder. Pain that is worse at night, or doesn't change at all when you move or rest, is different: see a doctor first.

What's the best mattress for back pain?

There's no best one to buy. In a 2003 trial in Spain, people with long-lasting back pain did better on a medium-firm mattress than on a firm one (Kovacs et al., 2003), so harder isn't better, and sleeping on the floor, which some popular videos suggest, isn't supported by it. The best bed is one you sleep well on. If yours feels wrong, try small changes first, like a different pillow. Our short read on the best mattress for back pain goes further.

What's the best sleeping position for lower back pain?

The studies behind this article don't compare sleeping positions, so there's no evidence-based answer here. Pick the position you sleep well in. If lying down makes the pain worse at night, or nothing you do changes it, see a doctor first.

Sources

This article draws on Victor Cardoso's interview on the Lutz Podcast, Peter O'Sullivan's lecture video, a diary study of sleep and back pain, reviews of sleep, pain and work, guidance from the WHO and the Australian Commission on Safety and Quality in Health Care, and one mattress trial.

• Lutz Podcast #181: Victor Cardoso, O problema da sua dor não é sua postura (podcast episode, Brazilian Portuguese, 2023)
• Gerhart et al., Relationships between sleep quality and pain-related factors for people with chronic low back pain (electronic diary study, 105 US adults with low back pain for six months or more, five ratings a day for 14 days, Annals of Behavioral Medicine, 2017)
• Buruck et al., Psychosocial areas of worklife and chronic low back pain (systematic review and meta-analysis, 18 studies, 19,572 working adults, BMC Musculoskeletal Disorders, 2019)
• Afolalu, Ramlee & Tang, Effects of sleep changes on pain-related health outcomes in the general population (systematic review of 16 cohort studies, 61,100 people, Sleep Medicine Reviews, 2018)
• Finan, Goodin & Smith, The association of sleep and pain: an update and a path forward (narrative review, Journal of Pain, 2013)
• Evoolve Pain Care Academy: Prof Peter O'Sullivan, Back pain, separating fact from fiction (lecture video with patient interviews, 2015)
• World Health Organization, Low back pain (fact sheet, 2023)
• Australian Commission on Safety and Quality in Health Care, Low Back Pain Clinical Care Standard: information for consumers (clinical care standard, 2022)
• Kovacs et al., Effect of firmness of mattress on chronic non-specific low-back pain (randomized trial, 313 adults, Spain, The Lancet, 2003; abstract only)
• Dr Alan Mandell, Sleeping on floor is better than mattress (YouTube video by a chiropractor, 2015; cited as the source of a myth)