Got Flies In My Lights!

My bed is considerably lofted, leaving my head only a couple of feet diagonally from the main light for our room. As I was lying there reading a couple of nights ago, my attention was drawn to the number of black specks resting at the bottom of the light. These had been pointed out to me before, and I was told that they were insects. But last night I really pondered the situation. How did these bugs get a) into my room, where I have never seen a fly, or b) into the actual lighting fixture, which upon close inspection seemed quite airtight. I proposed this question to a friend, who responded that those were not actual insects, but rather larvae. This satisfied me for a time, until it occurred to me that larvae have no more a way to get into my light than their adult counterparts. As with the previous post, any explanations are welcome in the "response" section.

Recommendations for the day:
DO reread To Kill A Mockingbird. I did so last week, and it made me very happy.
DO NOT get into existential debates with drunk people. Not at all as amusing as you'd think.
DO listen to my radio show, 3-5 Tuesdays. Although next week I'll be on break and not DJing.
DO NOT do as I did and come to school in upstate NY without a ski jacket.
DO listen to the band Stars. A friend gave me a CD a while back, and I listened to it all the way through yesterday. Very artsy and cool.
DO NOT type like my friend Ethan, who missed a lesson somewhere along the way, and now instead of using the shift key like the rest of us, turns the caps lock function on and off every time he wishes to capitalize something.