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Understanding the Sleep Cycle

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Understanding the Sleep Cycle

Why do we sleep? What is sleep?  Although we’re not aware of it, a lot’s going on when we’re asleep.  We need sleep for:
  • Physical rest: Our bodies need sleep to recover from the day’s activities. Just being alive and active drains our resources, and it’s when we’re deeply asleep that our bodies repair and refresh themselves. The more active we are, the more rest we need.
  • Mental rest: Our minds continue to work while we’re asleep. It’s thought that when we dream, we’re sorting out things that have happened to us during the day.

The stages of sleep:

Diagram of the sleep cycle
  1. Non-Rapid Eye Movement (NREM) 1 – this is very light sleep. You might jerk or twitch during this stage.
  2. NREM 2 – this is when your body gets ready for deep sleep.
  3. NREM 3 and 4 – deeper sleep. This is the sleep stage that provides the most rest for your body and mind.
  4. REM (Rapid Eye Movement) – This is the stage where your eyelids flutter, which is where it gets its name. It’s during this stage that you dream, and it’s very important for mental and emotional health and development.

We start off in very light sleep and go through the different stages until we’re in very deep sleep. We then move into dream sleep and slowly return to very light sleep, until we’re almost awake again, and then we once again go back through the stages into deep sleep. This usually happens twice at the start of a night’s sleep and then, although our sleep continues to cycle through lighter and deeper sleep, we tend to stay in the lighter two stages for the rest of the night.

What happens in the different stages?

It’s when we’re in deep sleep (stages 3 and 4) that our muscles get the rest that they need and our bodies try to repair the damage that we do to ourselves just by being alive and active.  This is the sleep that is essential for good physical health.

Our minds get the rest that they need throughout the night, though they also work quite hard during dream sleep. It’s thought that when we’re dreaming, our minds are sorting out what has happened to us during the day and are storing memories.

Related Resources

  • An Overview of SleepAn Overview of Sleep
    The amount of sleep required by each person varies. On average, people sleep between 7-9 hours a night, depending on a variety of things. Some people can function well with only 5-6 hours of sleep a night, whereas others may need up to 10 hours. It’s important that you find your own level.
  • What Causes Sleep ProblemsWhat Causes Sleep Problems
    All sorts of things can disrupt our sleep. Stress and strain can lead to sleep problems in the short term, but your sleep should go back to normal once the stress has resolved. If you’re continuing to have difficulty sleeping, this is usually because bad sleeping habits have developed, or worries about sleeping have started to take over.
  • Coping with Changes
    We all experience changes in our lives. Learn about how change can affect our wellbeing.
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