You could make a trap. What you do is you put a little wine or grape juice into a cup and put cling crap on top and poke a few small holes in it. I'm not sure about this but you can spread dish soap on the bug screen.

It's summer, and we have the window open, with the bug screen and it's not working! I've tried closing the window before but my parents won't let me, because they say they need to cool the house down. All these gnats are coming in, and getting all over my bed. I have an irrational fear of bugs getting into my stuff, and on me so I'm really struggling. Every night I pic up 2-20 gnats out of my bed before I go to sleep, and try to shoo them off too! I can't sleep because I fear that they will lay eggs in m bed, or crawl in my hair. One was on my face today for a second, and it really bothered me. I can't stop thinking about it, and I'm getting really stressed out. They are disgusting!!! Any methods? Can I spray the window with something, so they stop coming in? I really need help!