Each tradition within vipassana has a slightly different roadmap, but they all seem to have some sort of 'completely losing your shit' stage somewhere in the middle:

https://en.wikipedia.org/wiki/Vipassan%C4%81-%C3%B1%C4%81%E1...

See also Daniel Ingram's book, which Buddhist Geeks also talks about all the time: http://www.buddhistische-gesellschaft-berlin.de/downloads/ma...