Can we go on in hibernation by will at odd times?

Answer 1

Currently, humans hibernate, apparently, only by accident. But this may change:

"Humans have been known to hibernate by accident, Roth and his colleagues point out. . . . breakthrough suggests humans along with other mammals might harbor a mostly unused ability to hibernate on demand. "

Rest of fascinating article is at the science page:
http://www.livescience.com/humanbiology/050421_hibernation.html

Answer 2

Where there's will, there's a way