Unrelated, I've been listening a lot to Peter Attia, who has
this health podcast that I thin is pretty great. He's also the person who got me to start exercising seriously, I think I've talked about that before.
Anyway, the episode linked above is
half about the effect of sunlight on mood, sleep, and mental health. I have mood issues and I definitely have sleep issues, the evidence seems solid and the intervention cheap, so I didn't hesitate an ordered a
SAD lamp. (Then I ordered it again because it immediately broke but alas.) It's just a very bright light that you're supposed to have on (but not look at directly) for a while in the morning to imitate the effects of sunlight. Not needed if you actually go outside all morning, but very much needed if you're inside, whether windows are open or not because the light that comes in through windows is nowhere near bright enough.
Do I feel like it already had a tangible effect after two uses? Actually, yeah I do. Obviously hard to say for sure, but I can't imagine I'll ever discontinue it.