Earlier Bedtime Linked to Weight Loss in Prediabetics
A small randomized study found that adding sleep coaching to a lifestyle program improved sleep and daytime alertness among adults with prediabetes.
Updated on Nov. 3, 2026 in Sleep Disorders
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Nearly 200 adults with prediabetes who slept less than 6.5 hours a night were randomly assigned to an eight-week lifestyle program or the same program with added sleep coaching, with findings published in the journal Nursing Research. Earlier sleep onset, regardless of group, was independently associated with greater weight loss, while blood sugar levels did not change.
Why it matters
The findings suggest sleep timing, not just sleep duration, may be a promising new target for weight loss in people at risk of type 2 diabetes. Shifting bedtime earlier may limit late-night eating when the body processes glucose least efficiently.
The trial enrolled nearly 200 adults with prediabetes who slept under 6.5 hours nightly, and earlier sleep onset alone was linked to about 1.3 pounds (0.73 kilograms) of weight loss per hour shifted earlier. Blood sugar outcomes were unchanged, and the study did not track whether these effects persisted beyond the eight-week program.
The players
New York University
A private research university in New York City whose researchers led the study on sleep timing and weight loss in prediabetes.
The details
Participants in both groups completed weekly video calls on healthy eating, physical activity, and stress management. The lifestyle-plus-sleep group also received sessions on sleep hygiene, retraining the brain to treat the bed as a sleep cue, and a plan to gradually move bedtime earlier, producing greater gains in sleep quality and reduced daytime sleepiness.
Timeline
Eight-week program: participants followed the lifestyle and sleep components with weight measured over the period.
November 3, 2026: study findings were reported and published in Nursing Research.
Roadmap
The study builds on the Diabetes Prevention Program's lifestyle-coaching model, which established structured diet and activity goals as the standard for preventing type 2 diabetes. It extends that approach by testing sleep timing as an added target, a direction that has gained attention as researchers examine circadian factors in metabolism.
Adults with prediabetes who sleep under 6.5 hours a night may find that shifting bedtime earlier, even gradually, supports weight loss alongside diet and exercise changes. The findings come from a small trial, so people should discuss bedtime changes with a clinician before making them part of a diabetes prevention plan.
The takeaway
Adjusting bedtime earlier may be a practical addition to diet and exercise for people managing prediabetes, though larger studies are needed to confirm lasting benefits. Small, gradual shifts in when you fall asleep are the approach the study tested.
Further reading
For more on how sleep patterns affect health, see our Sleep Disorders coverage.
Source note: This article includes information reported by News18.
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