Flying Perception
It's mostly about time and energy at the same time. I'll have the time, but be so tired I can't think and usually find up falling asleep. Or, I have the energy but the time kind of vanishes on me.
Like tomorrow, my friend's car broke down at work on Monday, so we are renting a Uhaul truck and auto transport trailer to go get it. This is, apparently, cheaper than having it towed as it's way, way out in the boondocks. So an hour to get there, and an hour back after we get it loaded. It's only the starter switch that he thinks is broken, but in order to replace it, he's got to pull the steering wheel off.
So when I get up, 3-4 hours will be gone fetching his VW bug.