Sleep performs several important functions for your body and the regulation of cortisol (the stress hormone) is one such function, per Medical News Today. According to a 2017 study published by Obesity, chronic stress can be linked to weight gain. Meanwhile, a 2012 study found a significant association between weight gain and less than five hours of sleep, as opposed to participants who got seven hours of sleep.
Another hormone sleep has an impact on is the hunger hormone ghrelin. Getting a proper night’s sleep can keep your ghrelin levels in check, and therefore prevent food cravings or excessive intake of food.
While you might not think much of going to bed with your clothes on, a cooler temperature contributes to faster and better quality sleep. This has to do with your circadian rhythm and the optimal body temperature for sleep. “During the normal human circadian rhythm, sleep occurs when the core temperature is dropping. This drop in temperature starts about two hours before you go to sleep, coinciding with the release of the sleep hormone melatonin,” explained Katherine Hall, a sleep psychologist at Somnus Therapy (via Newsweek). Cooling your body by sleeping in the nude helps you fall asleep faster and also promotes quality slumber.