Prime Minister Sanae Takaichi said on Thursday she only sleeps for between two and four hours every night, while also facing criticism for encouraging people to overwork.

The revelation about how little she sleeps came after Takaichi raised eyebrows last week by arranging a 3 a.m. staff meeting in her office to prepare for a parliamentary session.

"I sleep about two hours now, four hours at the longest. I feel it's bad for my skin," she told a legislative committee, where she had been asked about the importance of reducing Japan's notoriously long work hours.