While visiting my 82 year old father recently, he said naps were his favorite thing to do these days. I thought about that and remembered my love of power napping in college. Who else loves naps besides 82 year olds? Older dogs and babies, that's who. And power napping? Beside students, I'd add shift workers and puppies.
Think about it for a minute.
Why do older dogs sleep so much? Probably the most likely answer is that they burn fuel fast and need to recharge. Also, like that rechargeable battery, the older they get, they stop holding their charge as long.