The periods of my life I was the most productive and learned the most were when those when I managed to sleep >=8 hours every single night, in a dark, silent environment. I still manage to sleep >=7 hours most nights, but I feel like it's getting harder to keep a baseline of 8 hours for every night. Don't know if my sleep needs changed over time due to aging, or if it's just a consequence of having more responsibilities.
