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We all do it. We stay up late watching that ball game or movie, sacrificing the amount of sleep we get that night. Then we figure we'll sleep in over the weekend to "catch up." Or we'll take naps during the day when we can. What many may not know is that a sleep-wake change like this is very common but can actually lead to a sleeping disorder.
We all have a biological clock that governs our sleep/wake rhythms, which is how our body knows when it is time to sleep and when it is time to get up. Many things can affect this clock. The biggest factor is the time we get up each day. When we vary the time more than an hour or so we are asking our body to make a radical shift in this mechanism.