One future Home Assistant project that I would love to implement is a whole house lighting system that gradually transitions all the lights from white/blue in the morning, to yellow/orange in the evening to aid natural melatonin production. Such a project would have to be fully automated, otherwise I'd forget to set it each day. Blue LEDs are terrible for sleep and throw off your body's natural sleep pattern. I got the idea from the excellent book "Why We Sleep"[1]. It's possible that a similar HA project already exists.