Thought of the Day - Sleeping

I previously wrote about wondering what the optimum amount of sleep is and preliminary results after 4 weeks of monitoring how rested i feel seems to suggest that:
If i get less than 10 hours then less is more and 6-7 hours seems optimum.
If i can get 10 hours that results in feeling the most rested.
That waking up earlier results in feeling more rested.
And finally staying up past midnight (regardless of when i get up) is the worst.

Of course my sample size is a bit low and once i get a proper sample size i will statistically analyse it, but so far the results seem quite interesting.