I work nights (I think it's into the third shift schedule) so I have to go to bed early and I use to take a full sleep cycle nap after work. I cannot sleep more unless I'm really exhausted, which usually turns into two sleep cycles. Of course it's not as regular as I would like because of family issues, but I try to keep focused in this full-cycle system. What I take into account is, as Zoth said, sleep quality. I mean, I already know from previous experiences how long does it last for me to complete a sleep cycle, so I always take that into account in order to take advantage of how much time is left, it doesn't matter if I can sleep two or three cycles as long as they are not interrupted.
About the amount of noise around, I had an analog clock in my room (those which use to make that hypnotic slow march sound) and I was surprised about how my mind turned all those sounds into the dream with no problem if not simply cancelled them. I think it's better to have that sort of curtain to cover annoying neighbor's noises.
Time to go to bed by the way 
P.s. Forgot to mention, right now I'm recovering my lucid frequency, although I think it has to deal more with my intentions than on how much sleep I have. Some good lucids took place during those naps as an example.
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