"I'm working long hours, right up until 12 o'clock, 1 o'clock in the morning," President Donald Trump said.
"What time do you get up?" Fox News' Bill O'Reilly asked.
"5 o'clock," Trump answered.
Some quick math shows that's just four to five hours a sleep a night for President Trump. That's well short of the seven to nine hours doctors usually recommend.
So how does Trump's sleep schedule compare to other presidents'?
Barack Obama wasn't getting many more zzz's. In 2016, The New York Times reported he got about five hours of sleep a night.
Bill Clinton was known as a workaholic. He reportedly got five to six hours of sleep a night. But unlike Obama, who spent many of his late-night hours alone, Clinton would call his cabinet and staff in the wee hours of the morning.
Trump might be getting less sleep than the previous three presidents, but George H.W. Bush may have him beat.
A White House nurse said Bush 41 woke up at 4 a.m. and didn't go to bed until 2 a.m.