Minecraft wiki entry for Things_not_to_do, associated text: Beds can be helpful by letting players skip through night and set their spawn point. At the same time, if blocks are placed around a bed, the player's bed is destroyed, or a second player sleeps in the same bed the player last slept in, their spawn is set back to the world spawn instead of next to the bed. Players can avoid angering fellow players by not messing with their beds.