I hate to work with less than 6hrs of sleep... :/

You get used to it, I'm on 4 hours right now, I always try to stick to an amount of hours that is a pair number, so 2 4 6 etc .. it has to do with your REM sleep cycles

I slept 5hrs on monday and tuesday and 6hrs today, catched the cold and this weekend is christmas...

I have to be fit by friday, otherwise even my free time is going to be sh*tty :/

I sleep 5.30hrs every night, and I feel damn good (when I get home after work)...

I generally work for around 16 hours a day and sleep for like 5

@nerwin @linuxxx Wow... I am still an apprentice but I am working around 7-8hrs(10hrs is the legal max.) and sleep around 5h45m per day...

How are you doing 16hrs of work every day?!

Wow, number of hours of work a day shouldn't be a badge of honour. Companies will bleed you dry for everything you have. Work somewhere that allows a good work life balance. You only have one life! Only work more long hours if you're starting your own company or maybe introducing new technology for a new project or something, don't make it an everyday forever type deal. The implications for your​ physical and mental health are not worth it. Work smart rather than work long.