A person who stays in bed until a relatively late hour(noun)
WordNet. Princeton University. 2010.
Use "lie-abed" in a sentence
"With all this she was a little of a slattern, something more of a lie-abed, and, above all, a gossip of the first water; neglecting house, household, and every thing else, to loiter slipshod in the houses of her gossip neighbors."
"She was no "lie-abed" in any case, and in her present nervous state she had to be up and doing."
"Mrs. Hazleton scolded her jestingly for late rising, and asked if she was always such a lie-abed."