Basically, if there's someone in spectator mode in the Overworld, sleeping is not possible, as it counts them as a player who's not in bed. It would make more sense if it counted like players in the Nether or End.
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Comments 17
This isn't really a problem. You don't need to sleep to set your spawn. You just need to lie in the bed.
See - http://minecraft.gamepedia.com/Bed
"If all sleeping requirements are met and the player enters a bed, the player will be positioned in the bed, in multiplayer you will be seen above the sheets, and the screen will slowly fade to black. During this time, the player can leave the bed by clicking the Leave Bed button. Once the player has entered the bed, the spawn point is set near the bed."
The fact that players in other dimensions will still allow players in the overworld to sleep proves that this is indeed a bug.
Is this still a concern in the current Minecraft version 14w11b or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. - bot