Staying in bed on weekends won't make up for weeks' worth of sleep deprivation. A new study finds that going long periods without sleep can lead to a sort of "sleep debt" that simply can not be undone with extra sleep.
Such chronic sleep lost may eventually interfere with a person's performance on tasks that require focus, becoming particularly noticeable at nighttime. This could be due to the effects of your natural sleep-wake cycle, or circadian rhythm.
Click on the link below to read full article
http://articles.mercola.com/sites/articles/archive/2010/02/02/lost-sleep-can-never-be-made-up.aspx
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