Ok how many hours do you people sleep? I mean what is your daily average ?

I sleep 5 hours roughly. I want to sleep more but I have to get up @ 5.20 for work and I get back from work around 7-8pm then I do my private design stuff till 12.

Will I self-combust? Are any of you in similar situation? Is there any way I can trick my body into believing that everything is fine?
I did lot of googling and looks like I need minimum 7 hours or I will be heading for serious trouble:-(