Energy is definitely a big thing. Half the reason I don't want to get out of bed early to exercise is that it's a big hassle for me to get out of bed ON TIME.

This morning, when I had nothing to do (I'm on school break right now)...I woke up around 8, but it took me a half hour to actually get out of bed, and the only reason I did get up even then is I had to use the bathroom.