Sleep loss boosts appetite for junk food and raises obesity risk

Research explains that insufficient sleep disturbs hormonal balance: leptin, which promotes satiety, falls while ghrelin, which stimulates hunger, rises. The circadian rhythm of these hormones is also disrupted, leading to nighttime cravings. At the same time, brain reward circuits become more active, the endocannabinoid system elevates levels of 2‑AG, and cortisol rises, all of which intensify desire for high‑calorie, sugary and fatty foods and reduce self‑control. These combined effects increase consumption of energy‑dense foods and heighten the risk of obesity, while also diminishing insulin sensitivity.

A practical tip for hotter nights suggests placing a clean sheet in a plastic bag and cooling it in the freezer for about 15 minutes before use. Lying on the chilled sheet lowers core‑body temperature, making it easier to fall asleep without relying on fans or air‑conditioning. The method should not be reused as a hot water bottle because rapid temperature changes can damage the material.