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Disruptions in cortisol levels will cause a person to be wide awake at night, but have a difficult time getting out of bed. Hormonal changes often follow and they may begin to gain weight in a specific pattern as well. Many people endeavor to lose weight by diligently watching what they eat and exercising, only to discover that it's virtually impossible to lose the fat in the truncal area, and more sit-ups are not the answer. (More on why you can't "spot reduce", or slim down individual parts of your body)
The missing link is often direct support of the body's normal stress response. In other words, begin to balance the stress hormones through some tweaks in diet, exercise and specific supplementation, and it becomes easier to lose weight, get more restful and deeper sleep, and increase daily energy levels naturally.