In old Rust I often did not know what to do at night. At first I was grilling the meat I collected but if my house was to small to effectively block the fire’s light I was luring people to my house. Later I started crafting stuff in a dark room waiting for the sun to rise but it never felt right not to have a real day/night-awake/asleep cycle.
With the reboot the devs announced that there might be metabolism that will even work when logged off. While staring at my sleeper on experimental and seeing a portion of what was going on around me I realized:
It would be awesome to sleep with the press of a button!
It would reduce the metabolic rate at night when you have nothing to do. You would never know if a sleeper was actually logged of.
Of course you would have to modify the sleeper screen so that you can not just lie around “sleeping” and still see everything.
I suggest either a black screen and only noises or a very VERY dark and blurry image of the world in front of you. For example you can still see a lightsource with your eyelids closed like a campfire but to notice an other player he would have to cast a shadow on you.
The main way to perceive your environment while sleeping would be hearing so sneaking towards a sleeper would be crucial. And if someone would try to smash your door you would be wide awake in real life long before he can get through.