If you're someone who prefers a window seat on a flight because you like to lean your head against the window and catch some Z's, you might want to reconsider. A flight attendant named Tommy, who shares travel tips on TikTok, posted a video where he explains why you should never lean your head against the window. He says, "You’re not the only one who has done that, and you don’t know how many people or children have wiped their hands – or other things – all over the window.” He says the window is one of the most unsanitary parts of the plane, along with the flusher in the lavatory. He says the seats are also unsanitary and advises passengers not to wear shorts.