It wasn't deep, but it had cost him blood and pain and the few minutes of catnapping he might have snatched.
also cat-nap, cat's nap, by 1823, from cat (n.) + nap (n.). A nap such as a cat takes. As a verb from 1859.
A short doze while sitting up: The Senator was enjoying a cat-nap at the time
[1850s+; Attested in form cat's nap by 1823]