According to a recent epidemiological study by Ahmed BaHammam, average nightly sleep on weekdays plays a key role in the difference between “average” and “excellent” grades. As this was a small epidemiological study, the standard causation-versus-correlation disclaimer is necessary. However, I still think that this adds to the literature relating sleep to performance.
Maybe this was my problem!
I now try to sleep seven to nine hours each night in a cold, dark room, and I’ve been feeling so much better, and it shows in my work and my life.