Summary
What is Sleep? ... COMPLETE!
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Your body is active during sleep, and uses the opportunity to grow tissue, increase immunity and consolidate memories.
Many things can prevent you from achieving good sleep, like burnout, anxiety, alcohol and relationship issues.
A healthy sleep cycle is made up of four stages, three N-REM stages (named N1, N2 and N3) and one REM stage.
While all stages of sleep are critical, the REM stage is the most important of all.