What time you like to get up in the morning is programmed from birth, or at least our biological clocks are. Genetics determine what scientists call a person's chronotype, a term for the time when you feel ready to start the day. So when the clocks change this weekend, early birds will rise and shine with a smile on their face, as they always do. Night owls might feel more rested, although who knows how it will affect their narcissistic tendencies? But your chronotype can say much more about you than whether or not you love the sound of a buzzing alarm. A a wide array of studies show early birds and night owls are very different creatures.