sketching in your head

the earliest i remember doing this was last summer..? i would sketch out the houses i passed by in my morning jogs in my head to keep me entertained. back when i was actually active ykk- sksk anyway/
a while ago, i saw a comment joking about how animators draw in all day every day, even in their sleep. since then ive tried to sketch or paint in my head. it can be anything ranging from: faces, bodies, my room, buildings, trees, clouds, etc. i break things down to their most basic shape then add color and shade/shape it.
it's become a habit and ive been doing it more recently since i dont draw as often as i should. ik ik, i need some self discipline-... anyway, do yall do it too or am i just going insane??