[pazimzadeh]

Unfortunately, the people used as examples do not support the claims (Marissa Mayer and Jack Dorsey). Perhaps those two are part of the 1 to 3% of the population who can get by on four hours of sleep at night. One of college professors had this phenotype.

Personally, I need between 8 and 9 hours to be at my best.

http://online.wsj.com/news/articles/SB1000142405274870371250...

[jes5199]

I've always assumed that Dorsey's comments about his sleep habits were a combination of macho bravado and myth-building - it's not like anyone is actually around him enough to know if it's literally true.