What do you call a person who doesn't wake up easily from a noise or a touch? I just want to know a word that defines what I am asking for.
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a Rip Van Winkle
–– all meaning fond of deep and protracted sleep.
Quite informal but someone might be described as "out", meaning "deeply asleep". eg
"Did you wake him up?" "No, he's out, man."
Obviously "out" has many meanings and so this usage is very context dependent. Still, it's a single word.
EDIT: this obviously isn't a characteristic, ie it's an adjective not a noun. OP, it's still not quite clear what you're asking for.
There is an idiomatic phrase sleep the sleep of the dead that is often used.
To sleep well without being disturbed
(informal) Fast asleep.
Oxford Dictionaries Online
The phrase dead sleep is also used.
If you want to be poetic, in the arms of Morpheus, suggesting a deep sleep as if induced by a narcotic.
The Free Dictionary