To bed, but only at night
No do not go
Yes, if you put a trap door in it next to you and then close it. Then you can also go through 1 block large openings.
Pocket edition
Yes and? As far as I know, Pocket Edition is also in 1.14
But in pocket edition that doesn't work with the trap door
If you swim and then swim in a hole that is one block big, it works.