Why some people can't sleep without the feel of mosquito net in the feet?

Sometimes, I find comfort in having my foot rub against the bedsheet. There's just something about such action that makes me doze off. However, I don't do this all the time. What I am wondering lately is why some people could sleep even when bitten by mosquitoes. I just couldn't sleep the same thing happens to me. My little boy couldn't sleep without his pillow beside me. I, on the other hand, when I feel restless, I like snuggling under my hub's armpit till doze off.

Not exactly the Mosquito net, but yes!! I can't sleep without the Fan. Even in the winters I would use my ceiling fan. I like the sound of the fan moving. This is a habitual behavior in the human being and almost most of the animals. I have observed even the House Rats would prefer to take the same route every single day at the same time to move from one place to other.