The way our bodies react to mosquito saliva motivates us to avoid being bitten. Which must have had evolutionary benefits, keeping us away from diseases.
I.e. all those people that didn’t mind them and never got itchy from mosquito bites appear to have died out. And mosquitoes really wish that wasn’t true.
That would mean when they bite you during the night when they can take their sweet time, you would wake up with no itchiness, but that’s not the case for me.
Maybe the nighttime suckers are kinky bastards who deliberately hock a loogie in you before they leave.
The huck tuah mozzies