Drugs, alcohol, and now coffee! I’ve used a variety of substances to self medicate while in a depressed mood. A few years ago I cut out cannabis, and I stay away from using alcohol when I’m down, but I have no limits with coffee. It seems like I can drink as much as I want whenever I want and it doesn’t create the same problems it does when my mood is better.
The half-time of caffeine in our bodies is pretty long, like 6 hours IIRC. Might affect the quality of sleep even if you manage to fall asleep