Motivated by a need for more time during his PHD studies, Akshat Rathi spent a year sleeping just three-and-a-half hours a night.
He says that he had heard the story of Buckminster Fuller, an inventor, who advocated the practice of a regimen that consisted of 30-minute naps every six hours, and decided to try something similar.
During his own experimentation, Rathi managed to fit in three 20-minute naps a day at the time - and in total, he only slept for four-and-a-half hours in a 24 hour period.
But he is not in any kind of a hurry to give up the mostly monophasic routine he has returned to now.
He talks to Jesse Mulligan about his sleep experiment.