Are you taller in the morning when you wake up? Yes, you grow taller while you sleep — up to 0.3 inches in the morning. But you shrink back down within hours of waking up. This daily height change is totally normal and resets with a good night’s sleep. So technically, you’re at your tallest first thing in the morning! References: 早晚身高差别的原因|腹肌|弯曲度_网易订阅 Your height changes daily: Why you are taller in the morning and shorter at night | - The Times of India