I think it’s the smell. I remember some scientist did a experiment where he sat in a room full of mosquitoes and counted the bites to different parts of the body. He got most bites in the feet but when he washed them and tried the mosquitoes stopped attacking feet more than other body parts.

1. Much harder for you to kill
2. under your desk is a safe dark place.
3. Mosquito could wait there for you to come the next day