Sleep

Sleep is listed here as a lifestyle factor, not a treatment. People with IBS report difficulty falling asleep, shorter sleep, frequent arousals, and unrefreshing sleep more often than people without it, and a 2017 systematic review of studies from 1990 to 2015 found a consistent association between poorer self-rated sleep quality and more severe and frequent gut symptoms, while noting that studies using objective measures such as polysomnography and actigraphy were inconclusive PMID 27683238. The relationship is plausibly two-way: pain and urgency disturb sleep, and disturbed sleep lowers pain thresholds and worsens mood.

Two small prospective studies have tried to establish direction. In St Louis, 24 people with IBS and 26 healthy controls wore wrist actigraphs for seven days while keeping daily pain and stool diaries. The IBS group actually slept longer (7.7 versus 7.1 hours) but felt less rested and had more waking episodes during the night (12.1 versus 9.3); the number of waking episodes predicted worse abdominal pain and gastrointestinal distress the next day, but not stool pattern or bloating, and mood partly explained the link PMID 27240555. In Seattle, 24 women with IBS kept sleep and symptom diaries for a full menstrual cycle and wore actigraphs for a week. Poorer self-reported sleep predicted higher next-day abdominal pain, anxiety, and fatigue, actigraphic sleep efficiency predicted next-day anxiety and fatigue but not pain, and in the reverse analysis symptoms did not predict subsequent sleep, which the authors read as sleep quality driving symptoms rather than the converse PMID 25142761.

Whether improving sleep improves IBS has barely been tested. A Boston pilot randomised 25 patients with IBS and poor sleep to four weeks of brief behavioural therapy for insomnia or self-monitoring. Sleep quality and insomnia severity improved significantly with the therapy, and 40% of the treated group had a clinically meaningful drop in IBS severity versus 17% of controls, but with 13 and 12 participants this was a trend rather than a significant difference, and the authors framed it as feasibility evidence calling for a larger trial PMID 32152868. Trials of melatonin, covered on its own page, found effects on abdominal pain that were independent of any change in sleep.

Points clinicians commonly raise: standard sleep hygiene, which means regular sleep and wake times, a dark cool room, limiting late caffeine and alcohol, and keeping screens out of bed, is low-risk general advice rather than an IBS treatment, and nobody has shown it changes bowel symptoms; persistent insomnia is a condition in its own right with an effective behavioural treatment (CBT for insomnia), and the pilot above suggests that treating it may help IBS as well; night-time symptoms that wake a person from sleep are not typical of IBS and warrant assessment; and because the studies are small and mostly in women, the findings are associations to keep in mind, not instructions.

Talk to a clinician before starting or stopping anything.