I have never been much of a nap-taker. Even when I am feeling sleepy, if I lay down and try to nap, daytime sleep evades. Interestingly enough, I usually do not have any trouble falling asleep at night. My occasional bouts of insomnia are usually due to a book that I find too interesting to put down.
It may be a genetic thing. My sister is also not a nap-taker, and my daughter never willingly took a nap when she was little. My husband easily takes naps, and I must confess that I am a bit envious of his napping ability.