Why does Lark tell me I slept well when I feel tired and groggy?

The statements "You slept OK" or "You slept well" are based on your time asleep, your sleep quality and other metrics. It is calibrated for the average healthy sleeper. But there are individual differences in how much sleep one needs and in sleep quality (for example both may decline as we grow older).   

Even when all the sleep data your Lark is collecting indicate you are sleeping ok or well, you may still feel tired, groggy or unrefreshed. This is usually the case when you are sleep deprived and have accumulated a lot of sleep debt. There may also be other factors affecting how you feel in the morning, for example a caffeine low or frequent disturbances just in morning. If you feel you are getting enough and good sleep mostly but still feel sleepy during the day, you may want to consult a doctor.  

Lark says I woke up a lot of times, but my sleep quality seems high. How does that work?
Wake ups are determined by movement patterns like getting up, tossing and turning or flipping over.  A lot of small wake ups usually indicates a poor sleep environment. Noise, light, discomfort may be disturbing your sleep more than you think.  And often, you may not be able to recall all the times you woke up because of a disturbance. Lark calculates sleep quality based your length to fall asleep, how long you sleep for, the number of wake ups and the magnitude of wake ups. Thus longer wake ups will affect your sleep quality score more than short disturbances. Healthy sleepers should have a sleep quality of 8.5 or higher and, in a perfect sleep environment, wake up 6 times or less during the night.
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    Salvador Jalife

    You should use the gender / age profile to tune these suggestions so they are more accurate.

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