Doctor Tipster: Cognitive Decline Can Result From Poor Sleep in Older Men

| Posted in Brain Health, Brain Research

Sleep is composed of different stages that form a cycle throughout the night. Good sleep is not just all about how many hours you have slept but also on how much of the various stages of sleep you get each night. The brain is responsible for these stages because it never actually sleeps while you sleep. The brain gives out a distinctive pattern of electrical activity known as brain waves during sleep. There are two types of sleep: rapid eye movement (REM) sleep and non-REM sleep. Non-REM sleep is composed of four different stages. Usually when a person sleeps, stage non-REM sleep starts, in which he or she sleeps lightly and can be easily awakened by noises or other disturbances. During this stage, the eyes move slowly and there is slowing down of muscle activity. Stage 2 non-REM sleep then ensues wherein the eye movements stop. During this stage, the brain gives out slower brain waves with occasional bursts of rapid waves. (April 21, 2014)