In an interview with the London Times, Hassabis said he puts in two working days: one during the usual working day; one during the usual sleeping night. On a standard day, Hassabis said he works at the DeepMind office near King’s Cross station in London, from 10.30am until 6pm. He goes home and has dinner with his wife and two children in the north of the city. And then he starts working again. Between 10pm and 4.30am, Hassabis has what he describes as "my second working day," where he focuses on creative problem-solving.
44 year-old Hassabis only seems to be having five hours sleep a night. But he is good with this.