How many hours do you sleep per day ?

ajun

Those days my sleeping period becomes shorter and shorter .

Six hour or less per day . But I didn't feel sleepy.

I have no idea....... Because I usually sleep at least 8 hours or more and get a nap at noon.

Has my body something wrong ? ...... Maybe It's ok?

Nevertheless,I consider some of you sleep less than me , for some guys here often write or reply posts late in the night. (so late )  

So robust that needn't long-hour sleep?