Past Release - (TU56/CU48/PS4&PSVita 1.55/PS3 1.56/WiiU Patch 26/Switch Patch 6, Past Release - (TU58/CU49/PS4&PSVita1.57/PS3 1.60/WiiU Patch 28/Switch Patch 9
Respawning from a bed can be blocked by signs and pressure plates (any type)
place down a bed and place "signs" or "pressure plates" on all 10 sides from which a player can spawn from a bed.
Then switch the gamemode to survival and kill yourself
When you respawn it willl display a message that the bed is missing or obscured.