Video that shows glitch:
https://www.youtube.com/watch?v=Rw841RDKlQQ&feature=youtu.be
The included image shows a construction that can be used to quickly replicate the feature.

Happens when attempting to sleep in a bed with a block directly or one block spaced above the players head.

Expected: Player enters bed, no movement.

Happened: Camera glitches around (see video).

Steps to Reproduce:
1. Put bed on platform, one side of the bed must not have flooring present (i.e. cliff of 1+ blocks).
2. Set block into position
3. Go in bed at night