Did you know that you're taller in the morning and... in space?
Astronauts who return from space are 3% taller than when they left. Because of the lack of gravity, they are taller, and their cartilage discs expand in microgravity. You stand higher in the morning because your spine has been free of gravity's downward pull for 8 hours. The rest also allows your spinal disc cartilage to plump up, making you taller!