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Going to bed earlier is associated with weight loss in people with prediabetes, according to a randomized controlled trial led by researchers at NYU Rory Meyers College of Nursing.

The study, published in the journal Nursing Research, found that adding sleep coaching to a diabetes prevention lifestyle program helped participants sleep better and feel less sleepy during the day, but did not change blood sugar levels. The results also point to sleep timing as a promising new target for weight loss.

"When we fall asleep—not just how much we sleep—seems to be an important and overlooked factor for weight loss and metabolic health," said Susan Kohl Malone, assistant professor at NYU Rory Meyers College of Nursing and lead author of the study.

Studies show that poor sleep—for instance, getting less than seven hours of sleep, going to bed late or irregular sleep patterns—is connected to weight gain and poor blood sugar (glucose) control. Sleeping too little can raise levels of stress hormones such as cortisol, which promote insulin resistance and can shift appetite hormones in ways that increase hunger and food intake. Similarly, going to sleep late can lead to late-night eating, when insulin sensitivity and glucose tolerance are at their lowest point.

"In contrast, falling asleep earlier may limit late-night eating and better align food intake with the body's optimal metabolic window," said Malone.

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