Multiple choice general knowledge science & technology We are about 1 cm taller in the morning than in the evening. True False Reveal answer Fill a bubble to check yourself A Correct answer Explanation True. Gravity compresses the spine throughout the day as we stand, sit, and move. Intervertebral discs lose fluid and compress, making us about 1-2 cm shorter by evening. Sleeping horizontally allows discs to rehydrate and expand.