I'm looking for a wearable, preferred a wristband, to track my sleep cycles and wake me up (silently) at the best time according to what it tracks about me.
If it has other features, such as activity/fitness tracking - cool, but that it won't be a must to wear it all day.
Side/on bad trackers won't be very useful for me, since I live with my girlfriend and so we sleep together in the same bad. So it shouldn't be distracted by other people in the room.
I checked this question, but it's a year and a half old, so maybe there are new things on the market that I'm not aware of.