It might sound funny and seem more like a tall tale, but when you wake up in the morning, you’re actually a tiny bit taller than you were when you went to bed. This is so because of the pressure put on your joints throughout the day. As you go about your activities, this pressure causes the cartilage in your spine to compress—just fractions of an inch, but enough to push everything down. As you relax in your sleep, it eases the pressure on your spinal disks, thus allowing you to return to your full height.
