Poor sleep can lead to a big appetite.
A new analysis in in the European Journal of Clinical Nutrition, found that restricted sleep of about 4 hours made participants in a small study eat an average of 385 calories more the next day. More fat and lesss protein were consumed.
Sleep debt leads to all sorts of physical changes that favor weight gain. These changes can increase calorie intake, as in a post-flight feeding frenzy, or reduce energy output or even do both.
See Chapter 10: Snooze, You Lose Weight: Sleep and Obesity in Globesity: Ten Things You Didn’t Know Were Making You fat.