As titled, villagers are able to slide around the bed they are sleeping on, and the floor, once bread is thrown in the area. 

Video attached does not reflect my first experience of the bug, which the bug was much more apparent - in the first instance, all villagers slid around the floor, and none dismounted the bed. They could travel several blocks (3-4) before they returned to their bed (by sliding). 

The video does show some examples of it happening.

Extra: Villagers can be pushed by contact while sleeping also - is this intentional, and to what purpose?