Sleepy Chicks - how many hours a day do they sleep?

[curiositykt]

My chicks are 9 days old, they seem pretty happy, they eat and drink.. they don't much like treats.. but they sleep constantly! Every time I check on them in the brooder they are asleep. They don't seem particularly cold or hot, but seem a bit annoyed when I tap on the box to wake them up to make sure they are alive. They've been pretty sleepy for the whole time I've had them.

how many hours a day do they sleep at this age?

here they are outside in a pen while I cleaned their cage yesterday.

 

[Kevin565]

I don't know an exact amount but many of my birds easily slept 12+ hours a day when they were young.