In the past 6 nights, I have done no more than 17 hours of sleep, including the power naps in some of the planes. This makes less than 3hrs per night. So what did this produce as negative effects? Well, bad concentration and paleness. Bad quality presentations. Forgetting personal belongings. Eating once a day. Drinking too much coffee. Moments of falling asleep while people demand my attention, and sleepless hours in bed, when emptiness is stronger than anything else and not allowing me to close my eyes.