I had this problem for most of my life, except for when I had no job and was doing Ironman training full time. Then I think my sleep/awake cycle was more like 6

I had this problem for most of my life, except for when I had no job and was doing Ironman training full time. Then I think my sleep/awake cycle was more like 6/6. Sleeping well was the best part of all that. I read somewhere that our cold weather ancestors evolved to expend about 6000 calories per day.