When riding a mount or vehicle, I was expecting to dismount when I tapped on a bed to sleep at night. Instead, it causes the player to float (hilariously) in various positions (see images).

Riding the following and entering bed causes this bug:

• a saddled pig (the pig will wander around causing the player to move around with it)
• Any horse
• A Boat (causing the player to glitch underground)
• A Minecart (causing the player to glitch underground)

Also, breaking the vehicle / mount may cause the player to float above the bed.