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Sleep data in the Flow app and web service
How you sleep is always individual — instead of comparing your sleep stats to others, follow your own long-
term sleeping patterns to get a full understanding of how you sleep. Sync your watch with the Flow app after
waking up to see your last night's sleep data in Polar Flow. Follow your sleep on a daily and weekly basis in the
Flow app, and see how your sleeping habits and activity during the day affect your sleep.
Choose Sleep from the Flow app menu to see your sleep data. In the Sleep structure view you see how your
sleep has progressed through different sleep stages (light sleep, deep sleep and REM sleep) and any
interruptions to your sleep. Usually sleep cycles proceed from light sleep into deep sleep and then to REM
sleep. Typically, a night's sleep consists of 4 to 5 sleep cycles. This equals to approximately 8 hours of sleep.
During a normal night's sleep there are numerous short and long interruptions. The long interruptions are
displayed with the tall orange bars in the sleep structure graph.
10. Deep sleep %: Deep sleep is the stage of sleep in which it is
hard to be awakened since your body is less responsive to
environmental stimuli. Most deep sleep occurs during the first
half of the night. This sleep stage restores your body and
supports your immune system. It also affects certain aspects
of memory and learning. The stage of deep sleep is also called
slow wave sleep.
11. Light sleep %: Light sleep serves as a transition stage
between wakefulness and the deeper stages of sleep. You can
be easily awoken from light sleep since your responsiveness
to the environmental stimuli remains quite high. Light sleep
also promotes mental and physical recovery, although REM
and deep sleep are the most important sleep stages in that
regard.
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