When your spouse falls asleep early while you're still looking to extend the evening, don't get too annoyed: Your partner may just be yielding to his or her body's innate clock.
Everyone has his or her own sleep chronotype, the personal biological clock that controls the body's rhythms and dictates whether people feel their best early in the morning, late at night or somewhere in between. And now, new research reveals that these sleep rhythms can vary by as many as 10 hours among individuals.
Sleepchronotypes also shift during people's lifetimes, according to the study, published Wednesday (June 21) in the journal PLOS One.
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