When I lack sleep, I find that I become undisciplined and give into my impulses and whims. I am unable to resist foods that I shouldn't eat, I cut my exercise routines short and I can't reign in my negative emotions (fear, anger, frustration, etc). I also can't control what I want to say despite knowing the consequences. Being in this state is a vicious cycle that leads to bad decisions and actions which leads to even more frustration not only because of the situation itself but my apparent in ability to stop the downward spiral.
The oft quoted line of the Greek Stoic, Epictetus, "It's not what happens to you, but how you react to it that matters.", truly holds the secret to happiness. Unfortunately when I lack sleep, I no longer have control of my reactions. Now this doesn't mean that I should not be held responsible for my actions because I definitely am accountable. I lack sleep due to the choices I make (working late, hanging out with friends, waking up early, etc). The good thing is that now that I have made this connection between sleep and self control, it impresses upon me the importance of a good night's rest and on the occasions that I don't get enough sleep, I need to be extra cautious of the things I do and say and be more vigilant with myself.
Now for all of you statisticians that argue correlation is not causation, you are correct. At the same time, my belief is no "cum hoc ergo propter hoc" (latin for correlation proves causation) but rather a function of my experience and intuition. Not very scientific but you always have the choice to agree or disagree with my views.
For those who has experienced the connection between sleep and self control and want to improve their sleeping habits, here is a link on How to Sleep Better.
Ok, time for me to get ready for bed.
