Scientists used to think that people were physically and mentally inactive during sleep. But now they know that's not the case. All night long, your body and brain do quite a bit of work that's key for your health. There are two main types of sleep that we cycle in and out of when we rest -- REM and non-REM sleep.You begin the night in non-REM sleep and spend most of your rest time there. It starts light, in the"N1" stage, and moves to the deep"N3" stage.
Though we've talked about them for thousands of years, they're still a mystery in many ways. It's not clear what causes them or if they have a purpose. They're most common during REM, especially when they're very visual, but you can dream in other sleep stages as well. Night terrors -- when people appear to be awake and cry out in fear or panic -- happen in deeper states of sleep.During deep sleep, your body works to repair muscle, organs, and other cells.
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