NOUN (3)

1. a person oblivious to social changes;

2. a person who sleeps a lot;

3. the title character in a story by Washington Irving about a man who sleeps for 20 years and doesn't recognize the world when he wakens;

WordNet (r) 3.0 (2006):

Rip van Winkle
    n 1: a person oblivious to social changes
    2: a person who sleeps a lot
    3: the title character in a story by Washington Irving about a
       man who sleeps for 20 years and doesn't recognize the world
       when he wakens