Sleep repairs the body. This has a positive knock-on effect to how you function cognitively the next and following days. When we sleep, we sleep in cycles of 60-90 minutes. During that time we oscillate between deep (so-called delta) sleep where the body repairs itself and the lighter REM sleep.
REM (rapid-eye-movement) sleep, or lighter sleep, moves information from your short-term memory to your long-term memory. This helps you to better recall information you absorb on a daily basis. It is during this REM phase of sleep that your eyes move rapidly from side to side (hence the name) and that you dream.
Getting to bed at the right time (ideally 10pm) and getting the right amount of sleep every night keeps your circadian rhythm in check. Your circadian rhythm is your natural body clock that gives you signals when it’s time for you to sleep and …