[EGreg]

Maybe it’s like anything else... to get into an activity you have to get some quick wins scaffolding. So you set it up from your previous day but not something insurmountable. But the same could be true if you were just starting on a new problem. A large reward/effort ratio motivates you to see what else you can get. And that’s true regardless of whether you were the one who set up the problem the day before.