Look for "decision fatigue", it's a theory saying that people who have to make a lot of hard decisions, usually at the end of the day are so tired in their mind that they can't get themselves together to decide anything.

The interesting thing is that it's usually seen in poor and uneducated people, not big bosses that supposedly has to make alot of hard decisions. It's more the "shit, how am i going to pay my rent this month"-questions that tires your mind. The theory was that because their minds, unconsciously, are so hogged up with these questions they can't get themselves together and change job, start studying, etc and thus get stuck in an evil circle.

Don't know if this applies to you but make sure you have all your basics together before you start diving into more tough areas.