This exactly.

I'm not anxious, I don't struggle with self regulation, and I'm extremely "mindful of the present". I just have no other time in my life to...

Well, okay, there's where I can't really justify my behavior. What do I do at midnight instead of going to bed? I waste what precious few hours I have to myself reloading Reddit over and over and over.

I suppose there's a case to be made for the benefit of simple recreation, but I don't really feel good about admitting that.