If only your face is uncovered, I think you are more likely to notice a mosquito, either by sound or by touch. On the other hand, mosquitoes can reach you throu

If only your face is uncovered, I think you are more likely to notice a mosquito, either by sound or by touch. On the other hand, mosquitoes can reach you through a net or thin sheet if it is against your skin, as I have found to my cost.