Sleep keeps metabolism high and reduce the production of ahormone called Ghrelin which is the hormone that makesyou feel hungry. Therefore this helps to keep weightstable and limits the risk of weight gain.
Inside us all we have an internal clockcalled the circadian rhythm whichoperates 24 hours. Throughout the day,a hormone called adenosine will build upin the brain which will make you feelincreasingly tired throughout the day.