Idiom? Speaking

I’m sick as a dog, at least that’s what I said last night. I never had a sick dog so I’m not really sure how sick that is or how long it will be until I’m feeling better. While we’re on it I’d like to meet the baby the metaphor (?) “sleep like a baby” was worded after. My babies were wonderful, but light sleepers. I think a more honest sentence would be; I slept like a baby last night, I was up every two hours. Which I was, leading me to say I’m still sick as a dog.  I do remember a friend having a sick dog once in college and she was told to feed it rice.  Rice? Is that what’s for lunch today? I’d just be happy to sleep like a rock right now.