It is our genes, age, environment, and lifestyle factors which determine our individual sleep chronotype.  Are you someone who wakes up early and feels alert right away, or does your brain hit its stride late at night? Whether you’re a morning lark, a night owl, or somewhere in between, the answer is far more complex than it seems.  According to Dr John Saito from the American Academy of Sleep Medicine, this largely depends on what people are in their lives.  “When we’re young, we tend to wake up early, and then when we get to our teenage years, we become night owls. Then in middle age, it kind of stabilises until we get to our senior years.…