A lack of sleep exposes you to an increased risk of weight gain. When you don’t have sufficient sleep, your leptin hormone, the hormone that regulates body weight, levels drop. This makes you feel hungry more easily and in particular, crave for higher fat and higher calorie foods.
In addition, many important bodily processes only take place when we’re sleeping. During these processes, our bodies make use of stored energy for repairing tissue and cellular regeneration.
Not having adequate sleep reduces the time our bodies have to perform these critical functions, and as a result, a lot of the energy that we consumed that day would simply be stored as fat.