I am still giggling as I write this, the girls were a bit upset with each other so out of habit I started whistling a lullaby like I did when my kids were upset as babies. EVERY single chick stopped moving and nestled down in the shavings and went to sleep! It was an instantaneous reaction. So I stopped and within two or three seconds they were chirpping and getting up so I whistled a different lullaby and got the same reaction. Has anyone ever had this happen?