extended meditation: turning inwards via self-induced solitary confinement won't get you any closer to truth or awareness ...it gets you sensory depravation.
as far as 'reincarnation' and 'Nirvana' - I wouldn't know, I haven't died yet. but I do know that all cultures have a different story to comfort themselves about death. It's not the literal story that is important, it's the fact they seek comfort in believing any story/path.
pray to get to heaven, meditate to reach nirvana, kneel to be with 1000 virgins...all variations of wishful thinking. Has nothing to do with truth but everything to do with the pursuit of self-comfort.
not to turn this towards a religious beliefs thread, but I do acknowledge a predetermined spiritual pursuit is some people's purpose of meditation....so it's worth sharing views on that aspect.