and even early death
no http://www.wired.com/2014/07/whats-up-with-that-why-does-sleeping-in-just-make-me-more-tired/?mbid=social_twitter

If you’re oversleeping on the regular, you could be putting yourself at risk for diabetes, heart disease, and obesity. Harvard’s massive Nurses Health Study found that people who slept 9 to 11 hours a night developed memory problems and were more likely to develop heart disease than people who slept a solid eight. (Undersleepers are at an even bigger risk). Other studies have linked oversleep to diabetes, obesity, and even early death.

vairāk atsauces, jo mans blogs jau nav tvnets:

http://www.health.harvard.edu/blog/little-sleep-much-affect-memory-201405027136
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2864873/