These are good suggestions. I like the sun-moon moving idea and the moonlight making night more visible. I'll have to think about the regular sleep time. So far, the game has been purposely designed so you run-out of stamina, then sleep, for 2 reasons.
1: Stamina is very low at the start, but as the game progresses the player can use upgrades and items to stay awake longer (indefinitely, if they wanted) and it become more about planning when you want to sleep.
2: Women appear in a staggered time setup. Every 8 hours is a different woman. So, the player can time their sleeping to meet a desired woman.
The recent versions do have 3 sleep setting styles, one of which shows the hours passing and what events happened while you slept.