REM stands forrapid eye movement. During REM sleep, youreyesmove quickly in different directions. That doesn't happen during non-REM sleep.

What Happens During Non-REM Sleep?There are three phases of non-REM sleep. Each stage can last from 5 to 15 minutes. You go through all three phases before reaching REM sleep.Stage 1:Youreyesare closed, but it's easy to wake you up. This phase may last for 5 to 10 minutes.Stage 2:You are in light sleep. Yourheart rateslows and yourbody temperaturedrops. Your body is getting ready for deep sleep.Stages 3:This is the deep sleep stage. It's harder to rouse you during this stage, and if someone woke you up, you would feel disoriented for a few minutes.What Is REM Sleep?Usually, REM sleep happens 90 minutes after you fall asleep. Thefirst periodof REM typically lasts 10 minutes. Each of your later REM stages gets longer, and the final one may last up to an hour. Your heart rate and breathing quickens.You can have intensedreamsduring REM sleep, since yourbrainis more active.

Insomniais asleep disorderthat is characterized by difficulty falling and/or staying asleep. People withinsomniahave one or more of the following symptoms: Difficulty falling asleep Waking up often during the night and having trouble going back tosleep Waking up too early in the morning Feeling tired upon waking

Sleepwalkingis a disorder that causes people to get up and walk while they're asleep.It usually happens when a person is going from the deep stage ofsleepto a lighter stage or into the awake state. The sleepwalker can't respond during the event and usually doesn't remember it. In some cases, he may talk and not make sense.Sleepwalking mostly happens in childhood, typically between the ages of 4 and 8. But adults can do it, too.Typically, the sleepwalker'seyesare open with a glassy stare as he roams the house. If you question him, he'll be slow to respond or not respond at all. When you get him back to bed without waking him up, he usually won't recall the event.

sleep, the deepest part of the sleep cycle, your body becomes largely disconnected from your brain this is why we don't hurt ourselves or our bed-mates during active dreams. Sometimes, the mind disconnects too early or too late from the body, leaving you unable to move voluntarily.