Not getting enough sleep and being exposed to blue light at night messes up your body's internal clock and hormone balance. This causes your hunger-regulating leptin levels to drop significantly and makes your body less responsive to insulin, which can increase your appetite and affect your metabolism.

Our current analysis shows that the evidence we have reviewed leans toward sleep loss and evening blue light exposure affecting your hunger hormones and blood sugar control. What we have found so far points to a connection between poor nighttime rest and changes in how your body manages energy. We analyzed the available research and found 1 studies support this idea, and 0 studies refute it. The evidence we have reviewed suggests that missing sleep and staring at screens late at night can disrupt your body’s natural daily rhythm and hormone balance [1]. When this internal clock gets out of sync, your levels of leptin, the hormone that signals fullness to your brain, tend to drop. At the same time, your body may become less responsive to insulin, the chemical that helps move sugar from your blood into your cells. This shift can make you feel hungrier and change how your metabolism works. The evidence we have reviewed leans toward these changes happening together, though we only have one assertion to look at right now. Our current analysis is based on a limited set of data, and we expect this view to improve as more research becomes available. If you want to protect your hunger signals and blood sugar balance, try to keep a consistent sleep schedule and dim the lights or use screen filters a few hours before bed. Small changes to your evening routine may help keep your internal clock steady and support your overall well-being.