tell me about dark retreats

[somniumrex]

i've read a little about them but don't really know much other than that they are time spent in total darkness. i've heard it's to simulate the experiences one has after death. how so? how does it work, what are the details? rules? methods? any info at all would be nice, thanx. to be clear: no one should try this! it would be a bad idea and is not safe for anyone. according to what i have read these practices are extremely dangerous and should not be used by anyone. the only people that do them are tibetan buddhist monks with years and years of training and even they have problems sometimes. it can cause psychosis.