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There are four stages of sleep in which the sleeping person sinks down:
. Stage 1: The first stage of sleep is a very light sleep. Stage 1 usually lasts just a few minutes. If the sleeper is not disturbed by anyone or thing, he or she will quickly journey into stage 2 sleep.
. Stage 2: This is much deeper sleep than stage 1. Dreams start to brew around here and although there are no clear images, vague thoughts and ideas drift through the sleeper\'s mind. If the sleeper remains undisturbed he or she will drift off into stage 3.
. Stage 3: Once more a deeper sleep stage. The sleepers\' muscles are all relaxed by now, and his or her heart rate has slowed down. The sleeper\'s blood pressure is also falling. His or her breahting is steady and even. The sleeper is difficult to wake now. Only two things can wake the sleeper now: a loud noise or an repetitious calling of the sleeper\'s name. Before long, the sleeper will dive into stage 4.
. Stage 4: It\'s the deepest sleep of all and the sleeper is almost impossible to wake now. If there is a loud noise or if the sleeper is shaken, it will take the sleeper a few seconds to wake up. The sleeper lingers the longest in this stage, but climbs back then to stage 2 and then enters the night\'s first REM period.
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