Awesome!! Thank yooouuuu!!!

Frepo I just uploaded mod for "Resting heals the player"

It should work fine. As long as a player is ejected from the bed (when saturation reaches 0) the server wakes up all.

Frepo I don't know, but it checks every player

Excellent! I was planning on modding this for our server (but didn't have the skill, at the time at least). It works on multiplayer servers?
I've made somewhat of an sleeping overhaul for our server. With mechanics that checks local temperature (including checks if you're in a room, wetness, wind, rain, and nearby heat sources). So if it's too cold or you're under open sky when raining, you won't be able to sleep. Then I made some extra tiers of beds (with some colored variants) that provide a warmth bonus, and low tier beds have a chance to break after use. I got it all to work (except for waking players up when hungry), but it's not very well done I guess. Like sometimes the break sound plays when just picking up the bed, thats only supposed to play when the bed breaks from using it.

If you like the idea and want to make this mod into more of an "SleepOverhaul" mod (would be nice if it was made by somebody who actually CAN code :D) I'll gladly provide you with my models and textures (and code *embarrased*).
Here's a summary of my take on it:

Bed tiers
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Tier 1: Strawbed (Sleep for up to 6 hours. 20% break chance. 0 degrees warmth bonus, 0% healing bonus)
Tier 2: Aged Bed (Sleep for up to 7 hours. 5% break chance. +3 degrees warmth bonus, +20% healing bonus)
Tier 3: Wooden Bed (Sleep for up to 8 hours. 0% break chance. +6 degrees warmth bonus, +40% healing bonus)
Tier 4: Velvet Bed (Sleep for up to 9 hours. 0% break chance. +9 degrees warmth bonus, +60% healing bonus)
Tier 5: King's Bed (Sleep for up to 10 hours. 0% break chance. +12 degrees warmth bonus, +80% healing bonus)

New mechanics
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- Can't sleep in rain
- Can't sleep when too cold
- Low tier beds can break
- Can't sleep when hungry (I was never able to implement this)
- Insomnia debuff when not slept for 48 hours (I was never able to implement this)
- Resting heals the player (I was never able to implement this)