Lukas Mathis on ego depletion:
Ego depletion is the idea that you only have a limited amount of self-control that you can “spend” each day. Every decision you make uses part of that limited resource and makes it harder for you to make good decisions; breaks “refill” your ability to make thoughtful (or any) decisions.
Applications that force users to make decisions deplete that same resource. The needless setting in your app, or that unclear screen that requires users to think about what they’re supposed to do, might actually mean that somebody stays in prison who should have been released.