A recurring tip I've seen in autobiographies or books on succeeding in business is "wake up earlier." I don't particularly remember which millionaires suggested that advice, but I'm sure it's more than one of them.
Clearly, sleep takes hours out of one's day – hours that could be used to be more productive. So on the surface, "wake up earlier" seems like good advice for those interested in productivity.
- How much sleep is enough? How much is too much?
- When is it too little sleep? What is the point of diminishing returns?
- What about the flip-side; "go to bed later"?
Looking to find that optimal point where both restfulness and productivity are well-balanced.
Good answers will provide pointers to definitive reference material, studies, or data.