A recent survey of 10,000 English men revealed that 48 percent actually fall asleep during sex.

I like the use of the word "actually".

http://www.livescience.com/mysteries/070315_sex_sleep.html

The author, a woman, has this to say.

I will leave frustrated American women with one final thought: if you are upset at the ubiquity of the post-sex snoring phenomenon, remember that things could be a lot worse. A recent survey of 10,000 English men revealed that 48 percent actually fall asleep during sex.
Talk about coitus interruptus!