Fear also keeps us alert and ready to react to the imminent danger. This is fine if staying up all night to solve an urgent problem is absolutely necessary, but too often we stay up all night worrying about something we can't do anything about, or a danger that evaporates in the morning light. Nighttime obsessions tend to reinforce the habits of worry, filling our mental multiplex theater with a program of non stop horror that keeps us hooked and hyper-aroused.
The horror movie marathon of the mind distracts us from healthier things to think about, like loved ones and joyful activities, which have a soothing effect on us. So fear keeps us focused on personal safety and erodes our capacity for intimacy and our social skills.
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Finally, because the look of fear is contagious, those close to a worrier are also likely to develop the habit of worrying, some of them before they are old enough to know what they are worrying about.
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So despite the fact that worrying is normal and can even be helpful at times, the habit of worrying is downright destructive to your longer term physical and mental well being and that of the ones you love most.