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

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In this stage, the breathing becomes rapid, irregular and shallow. Our eyes jerk rapidly in various directions, and our limb muscles become temporarily paralyzed. Sleep walking may occur during this stage.This is when dreams occur. This stage lengthens a lot the longer you sleep.

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The brain produces almost only delta waves, and there is no eye movement or muscle activity. Sleep walking and talking occurs during this stage. This stage also gets shorter the longer we sleep.

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Extremely slow brain waves called delta waves begin to appear, mixed with smaller, faster waves. This stage shortens the longer you sleep.

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Eye movements stop, and brain waves become slower with occasional bursts of sleep spindles (rapid waves). This stage also lengthens the longer you sleep, but not as much as REM.

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In light sleep, we drift in and out of sleep. We can be awakened very easily. Our eyes move very slowly and our muscle activity slows. This stage lengthens the longer you sleep, but not as much as REM.