Throughout our adult lives we're always reminded of the importance of getting a solid eight hours sleep each night - especially if you want to feel refreshed and energised the following day. But not everyone operates on the full eight hours - Thatcher famously ran the country on just four hours a night for example.

Margaret Thatcher isn't the only one however, as this new infographic from Big Brand Beds shows. According to the infographic, some of the most famous and productive (not to mention richest) people throughout history have survived on much less than eight hours sleep a night, with some surviving on as little as two!

You can view the full infographic below