below is a video of the famous marshmellow study where a child is left alone in a room with one marshmellow and told that he'll/she'll receive another if he/she can just wait. 2 out of 3 kids eat it immediately. 18 years later, those that resisted temptation had better jobs, education, and emotional well-being than those who couldn't resist.
self discipline, luckily, is like a muscle and something that you can make stronger. but it can also get depleted. so that means don't try to quit smoking, diet, and reorganize your desk at the same time.
ever wonder why you come home from a hard day at work and just end up taking it out on your loved ones? it's because you've probably used up all your self control at the office and are tapped out - literally. they say that sugar and laughter help replenish one's self control. this must explain my chocolate fix.