Ok this will sound weird I know but its true about me. As an autistic man I must script the appropriate behaviors and responses internally before I present them to the typical world. Once scripted I must develop a presentation scheme that blends with the context occuring in my life in real time. This scripting of my actions to meet typical realities demands is a painfully difficult extremely tiring series of internal processes I must do in real time. Its like being a Wolf and having to chase your own tail for a few minutes while you configure and load the scripts needed to dail the phone, talk to the people, modulate your voice in socially acceptable ways, remember all the human plesantries and rituals, remember and pursue your goal to the end, reach the meeting of the minds with the service rep required to form a legal contract, actively deflect all the flotsom of added services, advertisments and other inducements being thrown at you to avoid unwanted goods or services. Spend a few hours doing all these things while at the same time managing all your autism inspired challenges and you betcha yeah baby I am one tired old gray wolf after doing these scads of difficult socially complex things NT's think are easy as catching a breeze. Autistic's especially those of us who are successful have almost forgotten the whole infrastructure of scripts we use to get through a day without a meltdown so we wonder why doing the least little thing leaves us dog tired. In my case I am left Wolf tired after work. I am an IT specialist very little heavy lifting or physical labor but I get home each day drained of energy. Go figure!