SLOND - A sleep-enhancing bukkit plugin
Want to get to sleep sooner, but don't want one person to be able to skip the night?
Sounds like you need SLOND.
SLOND does away with the typical sleeping plugin formula of "50% of players must sleep", instead opting to be very annoying to get people to sleep!
When at least one player is in bed, everyone who isn't in bed will get a nice popup on their screen saying "SLOND!", with a repeating annoying beep. The player must either sleep, log off, go to the nether (or end), or die in order to make the message go away. This encourages them to help progress the night to day.
The source code is available on github here.