Science History: Nathaniel Kleitman Helps us Rest Easier | COSMOS Magazine

“When Kleitman died in California on 13 August 1999, aged 104, a University of Chicago obituary described him as “the world's first scholar to concentrate entirely on sleep” and “universally recognised as the father of sleep research”.

It says that before him, “few scientists had systematically investigated the intricacies of sleep, which had previously been dismissed as a state of quiescence”.