Why You Ache More After a Bad Night — An All-Nighter and Slightly Less Sleep Aren’t the Same
BaroSit · 2026-07-29 · 📝 블로그
Have you ever woken up after a bad night and found that everything aches a little more than usual?
I assumed that was just an off day. But when I went looking, it turns out this has been measured in the lab again and again.
The more I read, though, the more “no sleep, more pain” felt like a blur. Pulling an all-nighter and trimming an hour here and there for a few nights turn out to do different things.
① Cutting sleep really does change how pain is felt
A review pooled 31 experimental sleep studies covering 699 healthy people.
Two different pictures came out of it.
▸ A full night without sleep — both the point where something starts to hurt (the threshold) and the point where it becomes unbearable came down. Effect sizes of 0.74 to 0.95, which is not a small shift.
▸ Merely shortened sleep — the thresholds barely moved. What grew was how intense ordinary aches felt (0.30, on the small side).
One thing is worth flagging. The authors graded their own evidence conservatively: “limited” for the total deprivation findings, “moderate” for the partial restriction ones.
The direction is clear. The exact size isn’t settled.
② In the brain, amplification and control come apart
One study looked at why. After a night without sleep, the responses split.
▸ The region that first receives pain signals (the somatosensory cortex) — activity rose
▸ The regions that weigh and regulate those signals (the striatum and insula) — activity was blunted
The receiving side got sharper while the managing side got duller. Behaviourally, the range of temperatures people classified as “painful” widened.
There is one more interesting piece in that study.
Outside the lab, following 60 people through daily life, nights of poorer sleep quality were followed by more pain the next day. Changes in how long they slept did not predict next-day pain in the same way.
Tempting as that is, this is where to stop. It was 60 people reporting on themselves, and the statistics only just cleared the line. It doesn’t mean hours are irrelevant — only that this sample didn’t detect it.
③ So the all-nighter and the short night deserve separate treatment
A recent study makes the same split. Thirty-nine healthy adults shortened their sleep for two nights.
▸ Their pain thresholds did not change
▸ What changed was how much the same stimulus hurt
▸ Five inflammatory markers measured alongside showed no change at all
The study is candid about its limits. Many participants didn’t stick to the sleep restriction, so the researchers had to redefine the conditions afterwards, and the authors explicitly ask for cautious interpretation.
Still, it points the same way as the review. Lose a whole night and the threshold itself drops. Trim your sleep for a few nights and the threshold holds, but the same signal lands harder.
And on current evidence, a few short nights don’t appear to be stoking inflammation that then makes you ache.
One step further would exceed the evidence. These studies did not establish that the same thing happens to people already living with chronic pain — the review calls that part uncertain.
The claim isn’t that sleeping well treats pain. It’s that being short on sleep turns the volume up.
④ So what do you do with this today
If you slept badly and everything hurts today
You don’t have to read it as your body suddenly getting worse. It may simply be a day when the same state registers as more painful. Decisions like “how hard should I train” or “what is this pain telling me” can wait a day.
If you have been a little short on sleep for a while
More pain doesn’t necessarily mean more damage. It’s closer to the volume being turned up. But a stretch like that clouds judgement too, which makes it a poor time to decide anything big based on how much something hurts.
If not being able to sleep is the real problem
That is outside what this article can cover. Sleep itself comes before pain tactics, and it belongs with a professional.
In the end, there’s one more question worth asking about pain.
Not only “how much does it hurt?” but “how did I sleep last night?”
Today’s pain has yesterday’s sleep sitting on top of it.
The same goes for posture. Pain isn’t settled by posture alone — the day’s sleep, activity and tension all stack onto it. What BaroSit can help with is one piece of that: keeping you from staying in one position too long.
→ Have a look at barosit.com if you’re curious.
The evidence on sitting time and movement is collected at barosit.com/science.
Sources
• Chang et al., 2022 · Sleep Med Rev 66:101695 — 31 studies, 699 healthy people and 47 with chronic pain. Total sleep deprivation: reduced pain threshold and tolerance (effect size 0.74–0.95, “limited” evidence) / partial sleep restriction: increased spontaneous pain intensity (0.30, “moderate” evidence) / findings in chronic pain remain uncertain
• Krause et al., 2019 · J Neurosci 39(12):2291–2300 — heightened somatosensory cortex reactivity, blunted striatum/insula response, lowered pain thresholds. In a 60-person daily-life sample, changes in sleep quality predicted next-day pain (t=2.1, p=0.04) while changes in sleep duration did not (t=0.39, p=0.7)
• Staffe et al., 2019 · PLoS One 14(12):e0225849 — 24-hour total deprivation, 24 participants: impaired descending pain inhibition, facilitated temporal summation, increased pressure and cold pain sensitivity
• Matre et al., 2025 · Scand J Pain 25(1) — partial sleep restriction, 39 participants, crossover: thresholds unchanged, suprathreshold pain rated higher, no change in five inflammatory markers. Conditions were redefined due to poor adherence; the authors advise cautious interpretation
This article is general health information, not medical advice. If pain persists or worsens, or if difficulty sleeping continues for several weeks, please consult a professional.