Sleep Monitoring Devices

Does anyone else have a device that monitors your sleep patterns.  I use the Microsoft Band that gives detailed info that I'm trying to use to find the best time to take my last meds of the day that results in the best sleep.

It has lots of different sensors that I sure could be used in the same way that an Intel smart-watch was being used to monitor daily fluctuations that could help research into matching meds to symptoms .

Links to screenshots of the data it provides on sleep.

Any suggestions on how I can use this?