I was a good friend with a girl that this happened to. Through talking we came to the conclusion it was from practice that it happened. She used to masterbate late at night in Jr. High through High School, and would always go to sleep immediately after it. Her body just started to associate orgasm with sleep and the instant she would orgasm the body would send out the sleep hormones.
Body-Association is a very powerful thing, this happens more with guys if you imagine... rubbing one out before bed is a common occurance.
Naturally for males the sleep hormones are released after coitus, it is rare for women but does occur. Try to keep conversation with her after she O's, or keep her active other ways (you know what I mean), if you keep the enjoyment going her body will associate sex with... more sex. Enjoy.
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