I don't know if this qualifies as going cold turkey, but I"ll share anyway. On one evening my son went 7 hours without a feed, from 11pm till 6am. From the next night on, I stopped feeding him at night, I figured that since he'd shown me that he could make it through the night without a feed then I shouldn't give him one. If he woke up, I'd sing or pat and usually he'd go back to sleep after a bit of crying.
It's been 3 weeks, and we don't do a feeding before 6am. So, I guess it worked.