It is so easy to take everything for granted. Let's take for example, turning on the TV. Next to none of us give this simple task a second thought. I have had days when I came home from work so distracted that, after a few minutes of scurrying around the house, wondered if it was actually me that turned on the TV.
When you enter a room, do you make much of a mental exercise out of turning on the light? I don't. It is like breathing, I just do it. What about turning on a fan or changing the thermostat if you're too hot or cold. All of this is pretty simple stuff and most of us don't give it a second thought - that is, until you can't do it anymore.