That happens to me too sometimes. I don't know if it's just not feeling challenged from time to time or if it's times that when you're running around so fast that it takes a second for things to catch up to you when you slow down that you're not sure what to do or something else for a different person.

Hopefully something will spark your interest and you'll have the time to pursue it. Maybe you just need a little break to be bored/boring and then you'll bounce back when you're ready.