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When falling asleep, your brain begins producing Alpha and Theta Brain Waves. Eye movements begin slowing down as well. In this stage, you can be easily woken up.

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This stage only lasts for around 7 minutes.

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Brain waves during each stage.

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The Brain increases the amount of Brain Waves, these waves are called Sleep Spindles. Then, the waves decrease after the Sleep Spindles are produced. It becomes harder to be awoken. Waking up right after this stage would be ideal for a "power nap"

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This stage lasts for around 20 minutes.

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This Stage begins deep sleep. Delta waves become slowed down. Eye movement and Muscle activity halts. The body becomes less responsive to outside stimuli, so it gets harder to be awoken. After you slow down, Delta wave production speeds up. During stage four, your body repairs muscles and tissues.

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Three: Starts 35-45 minutes after you fall asleep.
Four: Lasts around 10 minutes.

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Your brain becomes the most active in this stage, and you start dreaming a lot during this stage. Your eyes jerk quickly in different directions in this stage as well. Heart Rate and Blood Pressure increase during this stage.

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You enter REM around 90 minutes after falling asleep. The average person has 5-6 REM stages a night.

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The Sleeping Stages occur in different orders throughout the night.