Mystery #4Tier 2hormones / growth
Why do you actually do most of your growing while you're fast asleep?
You might think you grow bit by bit through the day, but you don't. Most of your growing happens at night, while you're deeply asleep and not moving at all. In fact, the years when children sleep the most are the years they grow the fastest. Why would your body save its growing for the dark?
Your guess
What's your hunch about why your body saves most of its growing for the night?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
Make a guess to unlock the hints and the answer.