One of the big problems is the “8” for work turns into 9-10 easy. Then all your “to do” crap comes out of what’s left. It either means less play time / “me” time or less sleep. The rule is a bit misleading - it should be 12-6-6 in reality. 12 hours for work (including a lunch break and commute), 6 hours for sleep and 6 hours for everything else - kids, meals, errands, etc.
I know technically 6 hours isn’t enough sleep but I’ve been doing it for years. I feel a need fo get out and do something for myself every day (bike ride, surf, swim, hit the gym, whatever) and if it means I have to cut an hour or two of sleep time so be it... l
Life isn’t meant to be slept away. My cats do that for me (surrogate sleepers)