This study may show that more sleep may reduce longevity, but it doesn't say anything about daily well-being, alertness, and general state of mind. If I had to

This study may show that more sleep may reduce longevity, but it doesn't say anything about daily well-being, alertness, and general state of mind. If I had to choose between more sleep and feeling better and being more productive everyday (what 9-10 hours/night does for me) and living longer but feeling crappy all the time (6-7 hours/night), it's no contest.