Can sleeping near a window make you sick?

I recently changed my bedroom a few weeks ago, and I have my bed positioned right under my window, so that my head is directly next to it. I sleep with my window closed, and it doesn't get all that cold at night. Yesterday I woke up feeling very sick and congested. It might be because of my springtime allergies. But could this have anything to do with it, or make it worse? Or is this just an old wives tale? Please let me know 'cos I don't want to move my bed!