Deep Sleep o_0

So me n my friends have a question, seems to keep reoccurring in tha group...
Supposed to get 8-10 hrs of sleep a night, while bb! In my profession I'm up at odd hrs occasionally! So, I've read on different sites that it's not about the "hrs of sleep u get" but rather "level of deepness of sleep u get"...
So would it be beneficial to buy a can of the so called supplements out there that put u n a "Deep" sleep! Or does the old approach work the best, 8-10 hrs a night!?!?!??? Thanks!!!