Great idea, but I'll just leave this here:<p><a href="http://en.wikipedia.org/wiki/Sleep#Optimal_amount_in_humans" rel="nofollow">http://en.wikipedia.org/wiki/Sleep#Optimal_amount_in_humans</a>
The amount of sleep people need varies from person to person as far as I know. I prefer to sleep 7 hours in the night and take a nap in the afternoon, and that leaves me feeling pretty good most of the day. Some people I know can sleep less than that and feel fine, others sleep more than I do and need it.<p>As far as I know, sleep is an extremely complex topic that we still don't understand all that well, and in my opinion this seems overly simplistic. I do like the presentation though!
This would be much more interesting if it asked you about <i>symptoms</i> of sleep deficit. E.g., "if you go into a dark room and lie down in the middle of the day, how long will it take you to fall asleep?"<p>Someone who habitually sleeps 6 hours a night but never feels tired is probably fine. Someone who habitually sleeps 8 hours a night but always feels tired should try sleeping more, and if that doesn't work they should seek advice from a doctor.<p>I expect there is a large segment of people who suffer from sleep deficit and would be more effective if they slept more, but don't know that it would help them. I don't think this is the correct way to reach such people, or the correct message to give them.
<a href="http://www.sciencedaily.com/releases/2010/02/100201091632.htm" rel="nofollow">http://www.sciencedaily.com/releases/2010/02/100201091632.ht...</a><p>Science seems to contradict the premise of this project. The research out there seems to suggest anywhere from 5-7 hours can be a healthy amount for an adult human.<p>This sort of project <i>could</i> cause anxiety about lack of sleep therefore causing a further lack thereof.<p>TLDR: If you're tired sleep. If you're not.. stay awake.*<p>* A well balanced diet and exercise regime are recommended in order for this point to be valid.
Nice to see how it all adds up over time, at least it isn't compounding like my mortgage interest.<p>Couple UI notes, when I put in 7.2 the UI doesn't round the resulting 5.5999999999 to something reasonable so overflows text. Also it might be nice to have a gradient of colors (or at least a yellow alert) it is a little abrupt that 7.99 hours is "Drowsiness is red alert" and 8.0 hours is "perfect amount of sleep".
If I recall, there's a pretty decent correlation between people who sleep more than 7 a day, and increase in chance of a premature death<p>Also, you're missing out on so many more hours of conscious life :)