Sleeping involves more than just lying on your comfy mattress, and it’s not as simple as going to a state of uniform unconsciousness either. In fact, a lot of things happen while we’re sleeping and not all hours of sleep are the same. Indeed, there’s a sleep cycle that gets repeated about 5 times during an 8 hour sleep. You might have heard of terms such as deep sleep and dreaming — they all happen in different stages of a cycle.
via uratexblog.com
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