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"The reason is that our capacity to control impulses is limited on any given day. Sleep, downtime, or exercise is needed to recharge our supply. Stress, negative feelings, and 'high demand' environments diminish our reserve of self-regulation. That's why people tend to eat junk food when they are sad or at the end of the day when their will power is worn down after hours of refusing sweets. So it takes a lot of mental energy to inhibit the urge to check Facebook for the latest news. When you find that your teen responded to a string of texts while writing a paper, it may be more out of mental exhaustion than outright defiance."