Another interesting human fact: did you ever feel like a giant in the morning? You’re technically right. The cartilage in our knees and other areas compressed during normal daily activity such as sitting or standing. Most people are about 1cm taller in the morning than they are when they go to bed in the evening.
However, when you go to sleep, everything goes back to normal. The discs in your spine work in a similar way. While you’re sleeping, they resorb fluid, making you temporarily taller when you wake up.