User Guide

ABOUT THE SLEEP CYCLE
When you sleep,your body goes through a series of sleep cycles. The average adult experiences 4-5 full
sleep cycles over an 8-hour period.Each cycle lasts about 90-110 minutes and comprises five different
stages,as illustrated by the chart on page 8.
No two people have the same sleep cycles, and nobody has the same cycle twice. Many factors can
influence sleep cycles,including diet,exercise,medications,drugs or alcohol,stress,sleep disorders,and
sleep deprivation.Age and gender can play a role, too:women tend to sleep more soundly than men,
and as we age, we sleep more restlessly.
A typical sleep cycle has five stages and takes 90-110 minutes.During Stage 1 of your sleep cycle,you
sleep lightly.At Stage 2, your sleep gets progressively deeper. At Stages 3 and 4, also known as “Delta
sleep,” you sleep most heavily;this is when your body rebuilds itself.
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