Hmmm...I had the opposite problem. After a weight loss of only 20 pounds, I had so much energy I had trouble taking it easy - I would easily overdo housework, raking leaves, etc. I literally felt like bouncing.
I used to take naps, not every day but usually 1 or 2 on the weekends. Since I had surgery 2 years ago, I have taken a total of 3 naps. I felt tired, drained, listless, lazy...before I lost weight. But now, I get by on about 6 hours sleep a night, and hardly ever get tired. I guess I'm a weird one?
Be who you are and say what you feel, because those who mind don't matter, and those who matter don't mind. ~Dr. Suess