Lauded Stanford sleep researcher William Dement has done a lot of work to characterize fatigue and drowsiness. Generally speaking his conclusion is that sleep

Lauded Stanford sleep researcher William Dement has done a lot of work to characterize fatigue and drowsiness. Generally speaking his conclusion is that sleep debt is extremely common and also damaging. He gave an hour talk at Google going over many of his results. His manner in this is informal and drags a bit but the information is potentially extremely valuable for anyone experiencing the feeling of tiredness: https://www.youtube.com/watch?v=8hAw1z8GdE8 https://www.youtube.com/watch?v=8hAw1z8GdE8 Personal Growth Series: Dr. William Dement on Healthy Sleep and Optimal Performance