Napping is pointless in my opinion. I try not to do it and I get an average of merely 4 - 6 hours sleep each night, every night. Generally speaking, more than that is simply not worth it. My ex needed some 8 - 10 hours a night and I totally thought she wasted her life, she drinks far more caffeine than I do and yet cannot remain asleep and here I am up 18 - 20 hours normally each day and can pull an all-nighter easily enough simply because I need or want to with little ill effect. Today even though I was out clubbing and drinking last night and made it home and in bed at 6am I got 6.5 hours sleep and feel fine, I'm perhaps a little more tired for this time of evening than normal but not enough that I am likely to go bed before I am normally used to sleeping.