No, a few of my grown hens put their head underneath one of their wings.... I imagine they like the dark there.
I was out watching my month old chicks about an hour ago and it kills me how they just lay down and stretch out their necks... but I do have one Ameraucana chick that has started putting it's head under it's wing
I love how they fall all over the brooder box like drunkin sailors. I love it! They just seem to be like "think I'll take a nap" and it can be anywhere. I started letting my week old babies roost on a stick in the bottom of the box and drape over it. I can sit and watch them for hours