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A good question. One I intend to research into and come back with an answer :)

All these new gadgets - fitness watches and bands know how to detect sleep time and depth. I didn't take time to learn about the technology behind it - yet ...

I am certain it is not some eact science and that you have to take this data with a bag of salt.

What is true is that 5 1/2 hours is not enough. Consecutive nights of not enough are even worse.

Yeah, I went on that kind of sleeping pattern for a month and made me feel really bad... Luckily I have been able to sleep over 7 hours lately so I guess I'm ok

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