Stage Two
This is a period of light sleep before you enter a deeper sleep. Here, your heartbeat and breathing slow, and your muscles relax even further. Your body temperature drops and eye movements stop. Your brain activity also slows, but you experience occasional bursts of electrical activity.
Stage Three
You need stage three to feel refreshed in the morning. This is when your heartbeat and muscles are at their slowest, your muscles are relaxed, and it might be difficult to wake you.
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