![]() ![]() To dream, perhaps to learnĪ 2010 Harvard study suggested that dreaming may reactivate and reorganize recently learned material, improving memory and boosting performance. Dreaming is most common during REM sleep, but it may also occur during the early stages of NREM sleep. Blood flow to the brain increases sharply, and EEGs show spiking activity. The blood pressure, heart rate, and respiratory rate swing up and down, and healthy men develop erections. The body is immobile, but although the lids remain closed, the eyes dart rapidly in all directions. In many ways, REM sleep is the opposite of NREM sleep. Blood flow to the brain decreases, and electroencephalograms (EEGs) show slowing of the brain's activity. Breathing slows and the heart rate and blood pressure fall. During NREM sleep, body movements continue, but eye movements are quiet or absent. NREM and REM sleep follow on each other's heels both are important for health, but they are vastly different. During the course of a normal night, a healthy adult will experience four to six consecutive sleep cycles. After about 60 to 90 minutes, REM sleep kicks in it lasts some 20 to 30 minutes, and then NREM sleep returns to start a new sleep cycle. In turn, NREM sleep passes through four stages: onset (Stage 1), light sleep (Stage 2), and deep sleep (Stages 3 and 4). Sleep is divided into two major phases, rapid-eye-movement (REM) and non–rapid-eye-movement (NREM) sleep. To understand the results, though, it's important to review the stages of sleep. Setting the stageįour reports suggest that sleep may improve cognitive function. In fact, research suggests that even a brief nap may help boost learning, memory, and creative problem solving - all while your head is on the pillow. Health-conscious men don't take sleep for granted, and scientists don't either. Sleep deprivation is a major cause of car crashes and other accidents, and it has been linked to important medical problems ranging from hypertension, obesity, and diabetes to heart disease, erectile dysfunction, and possibly even prostate cancer. Without restful sleep, mood, concentration, and mental performance suffer. It restores mind and body, preparing both for the challenges that lie ahead. A good night's sleep is remarkably powerful. ![]()
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