In this stage, your brain waves are very slow and blood flow is directed away from your brain to your muscles, which restores physical energy in your body. Stage N3: This is the beginning of deep sleep, during which you are hard to wake up and if you are woken up, you will often feel groggy or disoriented for a few minutes.Your eye movement will stop completely, your heart rate will slow and your body temperature will decrease. Stage N2: This is the first stage of true sleep and lasts 10–25 minutes. Your eyes will move slower under your eyelids, and your muscle activity will slow down but you can be easily awakened by a noise or a sound.
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