ok people with As have slightly different neurology to non As people and a lot of us do not have the filters that filter out sensory input. we take it all in and this is very tiring for us, for our brains, it places us on constant sensory overload and the body switches off, shutts down and wants to sleep.
to use an example when a bear is chasing you through a forest , most people run for their lives. most AS people will run as well. But a non-AS person will just run and will focus on getting away from bear really quickly. an AS person will run but will be distracted and confused by the trees the grass, the hills, the sun, everything, we will count the trees turn around and estimate the weight of the bear, smell the pinecones, everything upto the point that we will notice how bright our own blood is when the bear kills us and our last word will be, it was venous blood as it was dull and the oxyhaemaglobin wasnt reflecting the light as bright as oxygenated blood.
while this is a demonstration to show how an AS mindset works it illustrates the enourmous mental effort we have burdened ourselves with just to perform a day to day task, without these filters we get very tired we get overloaded, we need sleep.
_________________
a great civilisation cannot be conquered from without until it has destroyed itself from within- W. Durant