Technically, yes…we do grow taller during our sleep. This is all thanks to our intervertebral disc found between each joint in our spine. Its job is to act like a shock absorber and allows movement of the spine.
During the day, the intervertebral disc is squished as we wake up, stand, and perform our daily activities. During the day we actually lose around one percent of our height! While we sleep in the night, the disc gets to recover and return to its natural state; hence, returning to our true height or the illusion that we grow taller overnight.
That’s why we all wake up slightly taller than our height prior to sleeping. Unfortunately, it’s not a height increase we retain but still an interesting fact nether the less and another amazing thing that our body gets up to while we sleep.