I have a new rule for myself (partially inspired by reading Scott Adam’s book How to Fail at Almost Everything and Still Win Big): I’m not allowed to be mopey or depressed unless I have exercised and gotten enough sleep on that day.
If I feel some kind of despondent, and I haven’t exercised, then I’ll stop bemoaning my situation and go exercise. And if I’m running on sleep deprivation, then I’ll nap first.
I’m allowed to feel grumpy or depressed after I’ve done both of those things.
I’m doing this because, a huge portion of my subjective well being and optimism depends on sleep and exercise, so I want to always make sure that those are taken care of before inhabiting an epistemic state in which things seem bad or hopeless.