I sleep 5 hours a night.

Even with flexible working hours, I still come to work in the early morning.

I work all day and then commute back home. I then do the chores and make supper.

By the time I am done with all that stuff, it's already 8PM or 9PM. I then get together with some night owls friends for a few beers, read all night, watch a movie or a tv show, or spend the night awake talking with my signifiant other (who is also a night owl).

If I have a really entertaining night, I might drop to 3 hours of sleep.

I don't have an energy problem and am wide awake. That being said, I have been living that way for as long as I can remember. I take naps when I do get tired.