The CEO of Google DeepMind juggles another job as the founder of a multibillion-dollar startup by starting a second workday at 10 p.m.

While many CEOs set their alarm clocks for a 5 a.m. wake-up time, Google DeepMind CEO Demis Hassabis has just hit the pillow after his second work shift of the day.

“I don’t sleep very much,” Hassabis recently said on Fortune’s Titans and Disruptors of Industry podcast with editor-in-chief Alyson Shontell. “I do try and get six [hours], but I have unusual sleeping habits I sort of manage during the day. [I] try and pack my day in the office with as many meetings as possible, back-to-back, almost no time, no break between.”

The AI pioneer has been on a winning streak since 2014, when he sold his AI company, DeepMind, to tech behemoth Google. The acquisition itself stoked fear among his competitors; Meta CEO Mark Zuckerberg’s higher offer was declined, and outraged by the deal, fellow tech mogul