There are no studies on this topic, but from what I've seen anecdotally on the internet from forums like quota, ect- narcissists often tend to stay up late and generally require little sleep compared to others. As the token NPD of SC, I can attest that I indeed suffer from staying up late then getting up early. It's like I'd rather be sleep deprived than wake up after everybody else. I like the solitude of the night and early morning. When my mind can just go wild with all the thoughts that flow through it without the expectations of others hampering it. I feel like I can just be me. I can really focus on my mind and it's nice. My technology addiction also makes this worse, as does my caffeine intake.
Does anybody else notice correlations between trouble sleeping and narcissism?