Labels:book | bulletin board | door | hakham | plant | sky | telephone booth OCR: W HAT HAPPENS HEN You SLEEP? N ADULT sleeps for around At 06 -minute intervals, you switch eight hours night. As an infant. rapid eye movement (REM) you need 16 to 18 hours but this sleep when you dream and your decreases with age As you slip from eyes move quickly as though wakefulness into sleep, you enter watching film A bout a quarter deep non-ra ipid eye movem ent sleep. of your sleep isREM sleep BRAIN -WAVE ACTIVITY ADULT SLEEPING CYCLES VV Your brain constantly sends out During a night's sleep an adult electrical signals called brain will pass from state of waves, which represent its wakefulness through two kinds nervous activity. When you are of sleep in alternating, 90- awake or drea ming the signals minute cycles. The first sleep are more intense deep and largely dreamless ADULI
