Intercourse is proven to make people sleepy. <img src="/ubbthreads/images/graemlins/sleepey.gif" alt="" />
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You can put yourself into a semi-sleeping state in which you are still partially aware of your surroundings but are nevertheless getting just as much rest for your body as if you were completely asleep. Some believe that you can even put yourself into this state while walking or running even, so you would never get tired. <img src="/ubbthreads/images/graemlins/eek.gif" alt="" />
This has been a pointless, inacurate, and more importantly <img src="/ubbthreads/images/graemlins/offtopic.gif" alt="" /> sleep-on brought to you by:
Killerzzz