These trackers can be very useful. I used to jog quite a bit so wear a Polar M400 watch which has GPS and a heart strap; it also measures steps. I aim for the 10,000 a day but I read an article the other day which discussing that it's not a realistic target for health. Can't be bad for you though so I'll carry on.
As you suggest reviewing sleeping patterns and whether or not you're sleeping well is pretty cool. It's good that you can start to pick up patterns of behaviour over time.