Earlier Bedtimes Linked to Weight Loss in Prediabetes
Adults with prediabetes who sleep under 6.5 hours a night saw better sleep and weight loss when sleep coaching was added to their lifestyle program.
Updated on Nov. 3, 2026 in Sleep Disorders
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A randomized study of nearly 200 adults with prediabetes who slept less than 6.5 hours a night found that adding sleep coaching to an eight-week lifestyle program improved sleep quality and daytime sleepiness, and that earlier bedtimes were linked to greater weight loss. The findings were published in the journal Nursing Research, and adults with prediabetes who are short on sleep are the group most directly affected.
Why it matters
Short sleep and late bedtimes are both recognized contributors to insulin resistance and hunger, so sleep timing may be a practical, low-cost lever alongside diet and activity in weight management. The finding arrives as prediabetes programs look for ways to improve results beyond diet and exercise alone.
This randomized trial enrolled nearly 200 adults with prediabetes who slept under 6.5 hours a night and assigned them to an eight-week lifestyle program with or without sleep coaching. The lifestyle-plus-sleep group showed greater gains in sleep quality and daytime alertness, and earlier sleep onset across both groups was independently associated with greater weight loss, though blood sugar levels did not change.
The players
New York University
A private research university whose researchers lead studies on nutrition, sleep, and metabolic health.
The details
The lifestyle program covered healthy eating, physical activity, and stress management through weekly video calls. The sleep component added sessions on sleep hygiene, retraining the brain to treat the bed as a cue for sleep, and a plan to gradually move bedtime earlier. Researchers point to two possible pathways: short sleep can raise stress hormones such as cortisol that promote insulin resistance and hunger, while late bedtimes often coincide with late-night eating, when insulin sensitivity and glucose tolerance are lowest.
Timeline
The eight-week program ran with weight measured at the end of the study period.
The findings were reported and published on November 3, 2026.
Health Landscape
Lifestyle-based prediabetes prevention has relied mainly on diet and physical activity, with sleep rarely treated as a formal target. This trial positions sleep timing as a possible addition to those programs, though it remains a single study of a modest group.
If you have prediabetes and regularly sleep under about six and a half hours, it may be worth raising sleep habits with your doctor alongside diet and activity goals. Working toward a consistent, somewhat earlier bedtime is a low-risk habit the findings support, though the evidence is preliminary.
The takeaway
Sleep timing may be a useful target in prediabetes care, not just sleep duration. Discuss your sleep schedule with your physician as part of a broader prevention plan.
Further reading
For more on how sleep patterns shape metabolic health, see our Sleep Disorders coverage.
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Would you try going to bed earlier to help manage your weight?
