Do you often check to see if things/people are dead?

What I mean by this is… when your pet or an infant or a loved one is fast asleep, or lying very still do you ever feel compelled to make sure that they are still alive?
I will often wake up in the middle of the night and shove my dog just to make sure that she reacts. Newborn babies get me the worst. I am constantly checking to make sure that they are breathing when they are asleep.
I have met other people who do this, so I know I am not the only one. I do wonder how common it is, though. I am also curious to know if it is more common among men or women.