I haven't had more than 6 hours per sleep per night in 25 years. A good 5 hours is plenty. Typically sleep from 11pm till 4 and get up around 5. Drink a ton of coffee and read for 1 or 2 hours. Then workout.
I am jealous of Seemay Chou. It would be amazing to feel alert awake and be productive with 4 1/2 hours of sleep.