Not in the public API. It may be something private, but you will not be able to use it in the app store. The only method I know about hibernation is the ability to turn off sleep while your application is running:
[UIApplication sharedApplication].idleTimerDisabled = YES;
I think the idea is that the software should not affect the hardware too much, i.e. running, hibernating exiting the application is not up to you, and exiting () with your application manually using the code will be a non-standard practice and Apple frowned. It's nice that your phone will sleep by default after a short period of time.
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