Lessons from Tracking My Productivity and Sleep

This is a crisper and more tightly written version than one previously submitted (and now deleted, because this is better).

There was one comment[0] on the previous submissions in which slvv[1] said:

    This kind of activity tracking and productivity management
    is so helpful for students at a variety of levels.  I wish
    these skills were clearly and intentionally taught either
    in high school or in early university! Even if everyone's
    goals and patterns are different, figuring out what works
    best is a HUGE asset. Your observations about your ability
    to estimate are especially interesting! 

[0] https://news.ycombinator.com/item?id=9522634

[1] https://news.ycombinator.com/user?id=slvv