Since i havnt answered this before i might aswel:
A// How much do you need? They say the average is eight hours a night. But I read someone saying he could do with four hours.
Anything between 8-15 depending on the week im having, im just always tired.
B// What are the consequences when you don't sleep the hours you need?
Tired most of the day, lack of appetite, feeling ill(i put it down to immune system having something to do with rest).
C// Is it possible to train your body and/or mind to be satisfied with less hours of sleep, or is it genetic?
I'd guess genetic, im never satisfied with less sleep.
D// Is too much sleep really bad for you? I heard it shortens your life.
Technically it doesnt shorten it you just spend more of it asleep, rather than the usual one third we spend asleep.
E// Is the time for going to bed and the time for getting up important?
So long as the right amount of time passes in between i doubt it, my sleep pattern varies depending on my next day plan and im fine if i get the right sleep in between.
I sleep better when im with my girlfriend, strange.
lol martian, i did have a strict routine when i couldnt get a job of at least 12 hours sleep and another 10 in bed, now i have a job im rethinking the routine to 14 hours sleep and 10 in bed.