I've also found that my thinking is at its best in the first few hours after I wake up. My creativity and problem solving skills steadily decline throughout th

I've also found that my thinking is at its best in the first few hours after I wake up. My creativity and problem solving skills steadily decline throughout the day, and at night I'm only good for fairly mechanical work. I don't think it's a time of day thing (I'm not an early riser) but more that your brain is refreshed by sleep. I wish I could take naps, it would be wonderful to regain that state mid-day.