Some fascinating research seems to indicate that dwelling on how tired you are might actually make you more tired, and your perception of the quality of your sleep (regardless of reality) can impact your performance the following day.
I’ve always argued that one of the reasons that I’m able to sleep fewer hours than most people is my ability to sleep efficiently. I am asleep within a minute of closing my eyes each night, I don’t toss and turn throughout the night, and when I awake, I am instantly out of bed.
There is no wasted time in bed. I sleep, and then I leave. There is not lounging in bed in the morning. No book reading or television watching. I may only be in my bed for about four or five hours each night, but I am asleep for all of those hours.
Many (including my wife) think that my “efficient sleep” argument is nonsense.
It turns out that even if it’s nonsense, simply believing that it’s true may benefit me, thus making it true.