Take a look at eastbound flights from the West Coast to the East Coast! I would venture to say 30-40% of them are red eyes, because the ability to try to sleep away the time, and not losing a day in travel are very important to a lot of people, not just business travelers. When I went to New Jersey last week, you betcha that my flight east was a red eye, and even though I was tired the next day, I got to spend a whole extra day with my best friend. Nothing else compares. In some markets, an overnight flight is the ONLY direct option. From San Diego to Miami, the only daily flight is a red eye, one of JetBlue's two to Boston is a redeye. One of US Airways' 3 to PHL is a redeye... the list goes on, but you get the point. It is a large market, and the ability to arrive in a destination without losing any time (get to airport [or in this case bus terminal] at 7-9 giving enuogh time for dinner and packing after a non-impacted day, and arrive between 5-7 in the morning, allowing for no wasted time there either).