Just like physical fitness there is also mental fitness. Everyone knows that if you want to be able to run long distances you have to train your body by continuously forcing it to the point of exhaustion, gradually improving stamina. I don’t think that it occurs to many people that they can do this with their minds as well.
I am always reminding myself to stay conscious and keep thinking, exhaustion is just an opportunity to improve stamina. It is amazing how much this improves quality of life by providing energy to improve relationships (probably the most mentally demanding task we have in life) and getting out there doing stuff.
After some time, thinking becomes much easier and clearer. Moving from being the mental equivalent of a couch potato to the mental equivalent of a marathon runner.
Life is consciousness.