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on Sunday night may result in starting a new working week sleep-deprived. Going by the book, the trick to avoid Sunday
insomnia and sleep-deprived Mondays is to go to bed and get up at the same time every day. However, if you've ended up
staying up late, you should rather compensate that with a nice early afternoon nap instead of sleeping in.
Scientific background
Polar SleepWise feature utilizes sleep tracking and biomathematical modeling for predicting daytime alertness based on
how one has slept recently. To predict how sleep boosts one’s alertness, Polar model evaluates sleep amount, quality,
and timing against personal sleep need and one’s body’s internal circadian rhythm. The model predicts one's boost levels
hour-by-hour, daily boost score, sleep gate, and sleep window. A sleep gate marks the start of one's sleep window - the
time when one's body would naturally want to be asleep. It takes from 1 to 2 weeks for SleepWise to collect enough data
to reach full reliability.
Biomathematical modeling is a generally accepted means to predict how different sleep schedules impact on alertness
during waking hours. Several biomathematical models have been introduced in the scientific literature. While the details
and terminology between the models differ, the models typically consider time awake, sleep-wake history, and the
circadian rhythm. The outputs of the models have typically been validated against a psychomotor vigilance task after
modest or severe sleep restrictions. The psychomotor vigilance task is a simple task where one presses a button as soon
as the light appears on a screen. Results from such a task correlate with maintaining attention, problem solving, and
decision making.
Nightly Skin Temperature
The Nightly Skin Temperature measurement automatically tracks your skin temperature when you sleep. It then
compares the result with your 28-day average, and shows the variation to that average. Tracking the variations in your skin
temperature can help you detect changes in your body's state.
In contrast to core body temperature, which is usually quite stable around +37 degrees Celsius (98.6 °F), the temperature
of your skin can vary much more. This is because the body regulates its core temperature through changing the blood flow
of the skin. Also, environmental factors affect the skin temperature. A variation of +-1 degrees Celsius / +-1.8 degrees
Fahrenheit is considered usual in skin temperature. Lower temperatures can occur quite often due to environmental
factors, such as colder room temperature or sleeping with your hand outside the covers. Higher temperatures might be a
sign of oncoming illness. Higher temperatures can also indicate being in the latter part of the menstrual cycle (ovulation
and luteal phase).
The skin temperature feature can't be used as a thermometer, as it doesn't show any absolute temperature values, only the
variation to your average skin temperature. If you're feeling under the weather, double-check your temperature with a
thermometer.
The temperature measurement feature and data is not intended for medical purposes, diagnosis or treatment.
How to start using the Nightly skin temperature feature
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