Theoretically compatible with all Spigot/Bukkit servers 1.8.X/1.9.X
This is a simple, sloppy plugin I wrote in one afternoon because I
couldn't find a decent alternative. All you have to do is throw the
.jar into your plugins/ folder, then do any further configuration
via the config.yml file, which should be generated the first time you
start your server with the plugin installed. By default, the server will
skip to dawn once 50% or more of the players are sleeping, then display
a "Good morning!" message to everyone in the Overworld.
I've never written a plugin for anything Spigot before, but I think
it turned out alright. Use at your own risk, but it shouldn't break
anything. At least, it works on my machine.
Oh yeah, did I mention I haven't tested it with more than one player on at a time? Let me know how it goes, please!