Taller in the morning

Do you realized that you are actually taller in the morning. I was amused that my rear-view mirror was in a lower position when I was driving in the morning so I think I may actually be taller in the morning. Once I Googled, and I found out I was actually right. But it was too much scientific information to digest.

Layman's question
Medical Explanation

Of course, the explanation is really...There is a slight difference in height from the morning to evening but it may not be measurable. While the body is resting at night the discs take in water to replenish and nourish them.