Hi Guest!
Read the FAQs to see if you have some of the other symtoms of sleep apnea:
http://www.apneasupport.org/about47.html
That sure sounds like "an" apnea. You can have up to 5 of those per hour and still be "normal". There's a couple reasons why I think you are able to notice that particular one, but without a sleep study, there's too much guessing, once you fall asleep there could be 1, 50, 100, 500, who knows. If the info in the FAQ sounds like you, see your doctor who may send you for the study.
sleepydave