Your body is metabolically active whether or not you're asleep. You can definitely lose weight during the day. It's possible to burn an entire pound of bodyfat in a single day with sustained aerobic activity. It's not even difficult to lose 5+ lbs throughout the course of a day from muscle glycogen and corresponding water loss. Even on rest days, I find that I am sometimes lighter before bed than I was when I woke up.
I agree completely that you "metabolise fat" all day long. I communicated this poorly in my original post.
In my experiments (using the widely understood concept of "morning weight = true weight") the fat I burned did not come off my body in a measurable way until after I slept. If I didn't sleep, my weight did not diminish until I did. The worse/less sleep I had effected the amount of weight I lost.
