Hi,
cold turkey method is to get through the adaption period in one shot,
which is hard, especially for uberman. it's the standard method,
though there are records of gradual adaption and the crash theory.
Experimenting with an alternating sleep pattern is not a good idea
unless you are an adapted polyphaser a certain time.
I recommend to read the book Ubersleep (
http://www.puredoxyk.com/
index.php/the-ubersleep-book/) and/or trawl the internet.
Greetings