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What are sleep cycles?
Sleep cycles are the patterns of brain activity and physiological changes that occur during sleep. They consist of different stages, each with its own characteristics and functions.
What are the stages of sleep?
There are generally four stages of sleep: NREM Stage 1, NREM Stage 2, NREM Stage 3, and REM sleep. NREM stands for non-rapid eye movement, and REM stands for rapid eye movement.
What happens during NREM Stage 1?
NREM Stage 1 is the transitional stage between wakefulness and sleep. During this stage, your body starts to relax, your heart rate and breathing slow down, and your brain produces alpha and theta waves. It is relatively easy to wake up from this stage.
What happens during NREM Stage 2?
NREM Stage 2 is a deeper stage of sleep. During this stage, your body temperature drops, your eye movements stop, and your brain produces bursts of rapid brainwave activity known as sleep spindles and K-complexes. This stage makes up the majority of your sleep cycle.
What happens during NREM Stage 3?
NREM Stage 3 is the deepest and most restorative stage of sleep. It is often referred to as slow-wave sleep (SWS) or delta sleep. During this stage, your brain produces slow delta waves, your muscles relax, and your body repairs and regenerates tissues, strengthens the immune system, and promotes growth and development.
What happens during REM sleep?
REM sleep is the stage where most dreaming occurs. It is characterized by rapid eye movements, increased brain activity, and muscle paralysis. During REM sleep, your brain consolidates memories and processes emotions. It is also important for learning and creativity.
