Science says at least 8 hours. I gnerally go to bed at max 10:30pm and wake up naturally around 7am. If I'm absolutely tired I wake up, drink water and crash until 9am or so -- it all depends, since I like to let my body decide. If I have a cycling race (generally they are early in the morning) I go to bed earlier. And then after midday nap xD
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Our bodies do a great job of alerting us to what we need. If you have dark circles under your eyes for instance, it's a clear sign that you did not sleep enough the night prior.
Yup, and the worst thing to destroy our health is the alarm. Walking up in the middle of the deep sleep cycle kills our regeneration process.