13 bizarre sleeping habits of super-successful people

AP

For busy, successful people, sleep is a precious commodity, rare and treasured.

So when it comes to getting a solid night of shut-eye, some do everything they can to not let insomnia, pressure at work, or snoring spouses get in the way, even if that means creating a weird nightly routine or napping to get through the day.

But for others — including President-elect Donald Trump — sleep isn't a priority, and they function on just a few hours a night. 

Here's a look at the most bizarre sleeping habits of 13 highly successful people.

This is an update of an article originally written by Vivian Giang.

President-elect Donald Trump only sleeps 3 to 4 hours per night.

On a typical night, President-elect Donald Trump only sleeps three to four hours — and sometimes as little as 90 minutes. 

First thing after waking up — typically between 6 and 6:30 a.m. — Trump is then handed a stack of all the newspaper clippings about him, which serve to both keep him informed and boost his ego. According to Michael D'Antonio, author of "Never Enough: Donald Trump and the Pursuit of Success," most of the time, he doesn't even read the clips — he just looks at his name on the pages. 

D'Antonio says that Trump's strange morning habit "gets him going and keeps him sustained" throughout the day. 

Michael Phelps sleeps in a chamber with air comparable to that at an elevation of 8,500 to 9,000 feet.

By engineering his bedroom environment to replicate that of a high altitude, Phelps decreases the amount of oxygen available, which forces his body to work harder to produce more red blood cells and deliver oxygen to his muscles. It also helps Phelps increase his performance endurance and prepare himself for competitions at high elevations.

"Once I'm already in my room I still have to open a door to get into my bed," Phelps said on the CBS News program "60 Minutes" in 2012. "It's just like a giant box. It's like 'boy and the bubble.'"

Arianna Huffington turned her bedroom into a 'slumber palace.'

After collapsing from exhaustion in 2007 — and waking up in a pool of her own blood — Arianna Huffington became an advocate for getting a good night's sleep.

Huffington turned her bedroom into a "slumber palace," complete with a canopied bed and blackout curtains. Before bed, she turns off her phone and plugs all her electronics in to charge overnight — outside the bedroom, according to The Cut. She then takes a hot bath, filled with Epsom salt and lavender oil, to calm her mind and help her forget the stresses of the day. 

What she wears matters as well, and Huffington sleeps only in garments meant for slumber; no old gym T-shirts allowed here. Finally, she dives into a book on poetry or philosophy and lets it lull her to sleep.