When you sleep, you grow by about 8mm!
However, this growth is just temporary, the next day you shrink back to your former height.The reason is that your cartilage discs are squeezed like sponges by the force of gravity when you stand or sit. Here's some other cool facts about your body:
- Your stomach's digestive acids are enough to disolve zinc. The cells in stomach lining renew so quickly that the acids don't have time to disolve it.
- A block of bone the size of a matchbox can support 9 tons of weight. That's 4 times as much as concrete can support!
- The focusing muscles of the eyes move 100,000 a day. If you were to give your legs the same workout, you'd need to walk 50 miles a day!
Check out more cool facts at the source.