It's interesting to me it has to be stated at all to be honest. When I don't sleep my productivity plummets, and it's pretty easy for me to make the link. Even

It's interesting to me it has to be stated at all to be honest. When I don't sleep my productivity plummets, and it's pretty easy for me to make the link. Even the difference between 7 hours and 8 hours makes a noticeable impact. I sometimes wonder if these kind of first hand experiences are something that should be a part of the education system, such as depriving yourself of sleep and recording the results, or exercising on and off for several weeks and recording your mood, etc. I find this kind of self experimentation highly informative, and these days I can easily 'feel' the effects of drinking/smoking/dieting/exercising/etc on my well-being and mood, which in turn gives me a lot more willpower to see things through when I can logically infer the cause of bad feelings/moods and know they are temporary.