When thinking about getting the sleep you need, it’s normal to focus on how many hours of sleep you get. It’s also critical to think about sleep quality and whether the time spent sleeping is actually restorative. Understanding the sleep cycle helps explain how certain sleep disorders, including insomnia and obstructive sleep apnea can impact a person’s sleep and health.

What Is the Sleep Cycle?

Over the course of a night, your total sleep is made up of several rounds of the sleep cycle, which is composed of four individual stages.

REM Sleep Patterns

During REM sleep, brain activity picks up to near the levels seen when awake

What Affects Sleep Stages?

Age

How Can You Have a Healthier Sleep Cycle?

Focus on improving your sleep hygiene

Stage 2 / N2

During stage 2, the body enters a more subdued state including a drop in temperature, relaxed muscles, and slowed breathing and heart rate

Are All Sleep Cycles the Same?

The first sleep cycle is often the shortest, ranging from 70-100 minutes, while later cycles tend to fall between 90-120 minutes.

Stage 3 / N3

Also known as deep sleep, this stage is critical to restorative sleep, allowing for bodily recovery and growth. Muscle tone, pulse, and breathing rate decrease as the body relaxes further.

Why Do the Sleep Stages Matter?

Sleep stages are important because they allow the brain and body to recuperate and develop. Failure to obtain enough of both deep sleep and REM sleep may explain some of the profound consequences of insufficient sleep on thinking, emotions, and physical health.

What are the Sleep Stages?

There are four sleep stages: rapid eye movement (REM) sleep, non-REM sleep, delta sleep, deep sleep, and deep sleep

Stage 1 / N1

This is essentially the “dozing off” stage, and it normally lasts just one to five minutes.

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