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Over the course of the night, the amount of time we spend in a particular stage of sleep begins to shift. During the first 2-3 sleep cycles, we spend most of our time in stage 3 and 4, whereas during the final 2-3 sleep cycles, we spend much more time in REM sleep accompanied by lighter NREM (stage 3 and 4) sleep

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Stage 1, Stage 2, Stage 3, Stage 4, Stage 3, Stage 2, REM sleep.

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We spend 20-25% of our 90 minute cycle in REM sleep. It stands for rapid eye movement. Brainwaves will speed up and dreaming occurs. Your muscles relax, heart rate increase, and breathing speeds up and becomes shallow. Alpha and theta waves are produced.

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We spend 12-15% of our 90 minute cycle in stage 4. You go into a very deep sleep, have rhythmic breathing, limited muscle activity, and brain produces delta waves.

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We spend around 4-6% of our 90 minute cycle in stage 3.  Deep sleep begins and brain begins to generate slow delta waves.

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We spend around 45-55% of our 90 minute cycle in stage 2. Your  pattern of breathing and heart rate slows down. You will have a slight decrease in body temperature. Starts to produces sleep spindles, very short periods of rapid, rhythmic brain wave activity.

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We spend 4-5% of our 90 minute cycle in stage 1. During this stage, muscle activity slows down and you have occasional muscle twitching. Alpha and theta waves are produced.