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The Sleep Cycle and Its Effects on Your Body

Light Sleep

  • Heart rate slows and body temperature drops as your body prepares for sleep.

Deep Sleep

  • The body grows and repairs tissues, builds bone and muscle and strengthens the immune system.
  • As we age, we get less deep sleep and sleep more lightly.  However, about 7-8 hours of sleep per night is still recommended.

REM Sleep

  • Usually, REM sleep happens 90 minutes after you fall asleep. The first period of REM typically lasts 10 minutes. Each of your later REM stages gets longer, and the final one may last up to an hour.
  • Heart rate and breathing quickens.
  • We dream during REM sleep.


Are You Sleep Deprived?