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Story summary
- Columbia University researchers found that losing about 90 minutes of sleep per night for six weeks added roughly one pound.
- In a 95-person trial, bedtime was delayed by ~90 minutes, cutting sleep by about 78 minutes.
- Participants gained a fifth-inch waist increase, higher leptin, and were 17 minutes more sedentary daily.
- Authors say a full year of comparable sleep loss could raise weight, type 2 diabetes, and heart disease risk.
