[jdironman]

What is the brand of the device? I am interested in getting one. I'm struggling today after little sleep, but I would also like insight on how much deep sleep I am getting.

[dakics]

Mi Band 3. It appears its sleep quality measurement through gyroscope/accelerator is accurate enough.

[lobotryas]

You don’t even have to get a device to get started. A cheap (but useful) app like Sleep Cycle will give you lots of info to start noticing patterns.

[chaostheory]

Apple Watch does the same thing, but you can choose from 3rd party apps as well.