Gnats!

[psy]

So, I moved to the south this year for grad school, and within the past month or so, my apartment appears to have become infested with gnats, especially around my kitchen sink (and by/on my toothbrush... major ick!) and my desk. I don't keep any food out food out (I used to keep bananas on the counter but no longer do, thanks to this problem) or have any plants, so I'm thinking it may be the trash or garbage disposal...? I know they're harmless, but it's kind of gross and annoying. I put in a maintenance order with my apartment, but any tips for getting rid of these things otherwise?

Thanks!