Slugabed

From Merriam-Webster's Word of the Day:

slugabed \SLUG-uh-bed\ noun
: a person who stays in bed after the usual or proper time to get up; broadly : sluggard

Example sentence:
Rather than be a slugabed for her entire vacation, Jeanne made it a goal to rise at 6:00 AM and go for a jog every morning.

Did you know?
The first known usage of "slugabed" in English can be found in Shakespeare's Romeo and Juliet (1592), when Juliet's nurse attempts to rouse the young heroine by chiding, "Why, lamb! why, lady! Fie, you slug-abed!" The first half of the word, "slug," is a now-rare verb once used in English to mean "to be lazy or inert" or "to move slowly." Experts believe this word to be of Scandinavian origin, and the same thing can be said of the noun "slug," which can mean "sluggard" or "lazy person" as well as refer to the slow-moving gastropod. The second half of our featured word, "abed," is a word still used in English today to mean "in bed."

Personally, I think Jeanne needs to have her head examined.