Why we sleep, sleep hygiene and more
Sleep is natural and reversible state of lowered responsiveness to outside stimuli, state of relative inactivity accompanied by loss of consciousness. During sleep no biological functions stop working. Sleep phases Sleep consists of two phases, non-REM phase and REM phase. When falling asleep we enter non-REM phase at first, muscles relax, breathing calms down and blood pressure lowers. We can dream during non-REM phase but after waking up...