You know how they say you should get a good 8 hours of sleep every night to function properly? Well, that may apply to the laymen, but not the people who change the world.

British furniture company Big Brand Beds offers up this well groomed infographic of 12 famous people (some of whom are still among us) and their peculiar sleeping habits. Each personality’s sleep patterns are measured in hours from 1 to 8 along with a ruler that shows the actual time of the day when they hit the sack. You won’t believe Thomas Edison’s schedule!