Are you sure about that? Stephen King stays in bed until 8 AM. His net worth is around 400 million last I checked. Ray Bradbury was famous for never getting up before 9 AM and Bukowski for sleeping until noon.
The morning person concept is a straw man. No truth to it. Other morning people will jump to agree and night owls will question themselves. Fact is, it’s not which hours you use, it’s how you use the hours you have.