Want to be as successful as Oprah Winfrey? Stop spending so much time asleep, slacker.
America's richest self-made woman has revealed her tips for success and they seem to be very simple: no one has made $1 billion while lying in bed.
The 61-year-old media proprietor and talk show host has told Fast Company she is able to function on an amount of sleep that is a little below the recommended eight hours.
"I function very well on five-and-a-half hours of sleep," she said.
"Anything less than that, I notice a lack of focus, a listlessness, a waning energy, and not-as-sharp thinking."
Winfrey starts her day between 7.16am and 7.23am.
Despite those specific times, she insists she relies on her body clock to wake up, adding that alarm clocks make her "agitated".
"Everything begins and ends with stillness: a conscious awareness of my presence within the greater presence of all, whether I'm paying attention to the way the sun's rising, or whether it's misty out in the morning on the trees," she said.
"When I wake up now, I have the privilege of listening to real twitter."
Of course, Winfrey, who has a net worth close to $US3 billion ($4.1 billion), isn't the only celebrity whose sleep patterns don't meet the standard 11pm to 7am.
Fellow talk show host Martha Stewart also favours limited sleep.
A 1995 profile of the lifestyle celebrity in People magazine reported that Stewart only slept for four hours a night, saying that there were "not enough hours in the day".
However, some celebrities operate at the other end of the sleep spectrum.
Speaking to Interview magazine in 2007, Mariah Carey confessed to sleeping 15 hours each night (while surrounded by 20 humidifiers, no less).
