Raptor, I have slept in a few of them in my time.
Quinzee--how to 'build' one.
As an incidental remark, they can be a great survival shelter if y'ever need one. If you are not familiar with them, the one thing I'd add is that you should let the snow 'set' for three to four hours before hollowing it out. That's the only drawback. However, in a pinch, let the snow itself be your blanket.