This forge mod causes monsters that are preventing a player from being able to use a bed to be highlighted for several seconds when the player attempts to use a bed and fails due to the presence of those monsters.
This mod is completely serversided; it does not need to be installed on the client side to function unless the user desires to use this mod in singleplayer or in a LAN world they are hosting.
The duration of the highlight effect is three seconds by default; this can be adjusted in the server config.
