Suggestions
Time of day tracking
Tracking in Exist is currently limited to once-per-day averages, but it could be such a more powerful tool if you could track these attributes by hour, so you could start figuring out correlations with what activity you were doing that made you happy, what times of day you are most productive, what times of day you are most active, the best times of day to get something done or to take a nap, and more.