I can hear a mosquito buzzing, but I can't see it ㅠㅠ

I went to bed early because I was tired, but as soon as I lay down, I could hear a mosquito buzzing near my ear and feel it hovering around my legs...
When I try to catch it, I can't see it at all ㅠㅠ
I don't think I'll be able to sleep well if I don't catch this thing, it's so frustrating