Fun body fact:
Ever wonder why you are taller in the morning? When standing, the entire weight of your trunk, head and arms is transferred into the bodies of your vertebrae. Between your vertebrae you have intervertebral discs made up of a tough outer fibrous layer and fluid inner layer. As the vertebrae compress during the day with activity some of the fluid layer is squeezed out. When asleep, the pressure is relieved from the spine and the discs restore to their full thickness again, hence why you could be taller than the night before.