The Internal Alarm Clock

This actually happened to me today...

Ever wake up five minutes before your alarm rings? This mysterious phenomenon isn't just bizarre coincidence. We are all equipped with our own internal alarm clocks and, best of all, they even have snooze buttons.

Jan Born and fellow researchers at the University of Lubeck in Germany have discovered what may be the first biological evidence for the curious ability to wake up at will. Anticipating the time you want to rise seems to trigger the release of hormones normally secreted by the body in times of stress. About an hour before you've planned to get out of bed, these secretions increase in preparation for the "stress" of waking.

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