'For some people, getting out of bed each morning is a daily struggle that can disrupt their lives. Making matters worse is when daylight savings time begins and we move the clocks forward in March, further creating instability in our cycle.
Some experts believe some people have internal body clocks that run longer than 24 hours, or at the very least have slower adapting mechanisms to the traditional daily cycle. This means they are out of sync with daily rhythms and that the body's internal clock does not effectively create a signal that divides the circadian cycle into two distinct periods that mesh with societal expectations--a biological day and a biological night.'
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