Oh yes
It is quite normal for babies to sleep a lot, especially after shipping. Don't worry if they all lay down flat and look like a little carpet. I've noticed that mine also sleep like this when the weather is rainy outside....Maybe it's just me? I don't know. All I know is that my little chicks love to sleep. After all, sleep is essential for growth. (And chicks are active at night if they have a light, so this might also cause random naps) Good luck
