Sleeping peacefully (like a baby) or sleeping fitfully (like a grown adult)

 from the screenplay for

Triage (2009)

character

JOAQUIN MORALES:

"You know, you sleep very peacefully,

there's not a movement, not a wrinkle

in your face, like a baby"

MARK WALSH reply:

"That's a good thing, isn't it?"

JOAQUIN MORALES:

"No!  If you were thrashing about

and muttering to yourself it would

mean a problem is close by.

But, peacefulness in a grown man,

that is not a good sign!"

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