I substitute food for sleep and sleep for food, whichever is less.
And it made sense, and still does, despite the tendency for me to get drowsy after eating. I just seemed right in a "matter and energy are interchangeable" sort of way.
I still stay up late at night and often pull all-nighters, generally to straighten out my sleep schedule after falling into a nocturnal pattern. Usually I don't make it as long, though, because I don't have that intensity, that focus to finish anymore.
But the axiom has still stuck with me even though I feel my body aging more quickly because of weight and mental sluggishness. It remember Colin's exchange rate because I never broke those sleeping patterns and habits and while my body rebels against me.