At Stanford, Dr William Dement created the world’s first successful sleep clinic and taught a popular class on sleep and dreams, reports The New York Times, adding that If he caught a student dozing, he’d wake him with a water gun.

Dr. Dement spent his working life as a popular professor in the department of psychiatry at Stanford University, where he started what is believed to be the world’s first successful sleep disorders clinic. He taught a class on sleep and dreams that drew as many as 1,200 students.

When he awakened dozing students with spritzes from a water gun, Dr. Dement gave them extra credit if they recovered and shouted, “Drowsiness is red alert!” — his rallying cry to make sleep deprivation a public health priority.