For me, I think I'm the most tired when I don't have a routine, or aren't sticking to a routine.

Recently moving house whacked me around something tragic, but I'm starting to get a routine, and that's helping!

Patting cats/contact with animals seems to make me generally happier and more energetic.

(Also, my Crohn's made me really tired pretty much all of last year. I was shocked by how much better I felt after I was properly medicated!!)