sometimes life can be so mundain, feelings and the things in your life become so well known to your brain that imagining things is as good as doin them.

So is it possible to be mentally self indulgent.

Because no one can be harmed in your head (maybe you can).

No one can be harmed (in your head) except if you so choose. Be the ego.

Also Lots of concepts dont work and or exist.

Unless your thinking of them working or in existance.

You can run real time virtual reality simulation in there to entertain you, or to pridict outcomes.

FREE YOUR HEAD SPACE