This could be one of the coolest ways to spend the night in New York I've ever come across. From now until January, the Guggenheim Museum is allowing visitors to overnight in its "Revolving Hotel Room" exhibit.
Unfortunately, reservations, which went for about $800, have long been booked (the museum's first guest was actress Chloe Sevigny), but you can still oooh and ahhh at the room designed by artist Carsten Holler during the day as part of theanyspacewhatever exhibition.