I've worked third shift for the last 15 years, and for the past ten have gotten paid to watch other people sleep..... Third shift can be hard, especially if you try to maintain a sociable schedule with "day walkers". Sometimes they just don't understand that afternoon nap!!
However, reasons I love third shift......
less traffic, or at least in my direction
I get more work done at home (live in the country)
People don't know when I sleep so they just don't call (except for my daughter she doesn't care... haha)
You can have a nice cold beer for breakfast on your day off, and nobody even thinks a thing about it!!