I had horrible sleep habits. I had a horrible lifestyle, that encouraged my horrible sleep habits, and made me think they were beyond the realm of my control.
I would NOT be able to sleep, for 24 hours to 5 days, and then I would grab 3-5 hours and be 'rested'. After a few weeks of that I would crash for a day or two, which did not convince me I needed regular sleep, only that I needed to set aside a few days to be dead to the world. That went on for a number of years.
It's worth noting that, then, I had no idea of the importance of sleep, and I was often manic, or in a mixed-state of bi-polar, where I would be depressed, but with excess energy, so sleep did seem impossible, and unnecessary. It's also worth noting that before embracing paleo, I was out-of-control bulimic, which messed up EVERYTHING.
Then, half a year ago, after I cut out sugar, grains, and the diet soda I used to guzzle (because it filled my stomach, so I wouldn't have to eat, because I've never trusted myself around food, which is something I can do now, eating real food!), I embraced the paleo lifestyle, regarding the reduction of stress, and the importance of sleep. I've been working harder to cultivate relationships with people, for my general mental well-being, and because I now have much less crippling social phobia. I've been moving around more, and sitting less, trying to expend energy so that my body can be ready for sleep.
I also used to sleep with the television on, because I would have a full-blown panic attack if I was alone, in the dark, and panicking made sleep impossible. Now I know that wasn't helping, and I needed to deal with my fear of the dark.
Sorry if that was long, and focused on other lifestyle aspects than simply sleep, but eliminating or modifying the deleterious aspects of my whole lifestyle, that were encouraging overall un-wellness, have made my sleep schedule go from insanely erratic, to a consistent 7 hours a night, from 11pm-6am.
Oh, and I dream now, and remember my dreams! That makes me very happy. This all makes me very happy, because I now feel like I have a choice in how my life works.
edit::: OOPS! I got so excited being able to talk about the difference that I feel, that I don't feel I properly answered your question!
So... to sum up my ramble, and give the relevant point:
Before paleo: 3-5 hours every 1-5 days (most often every 3 day), then 24-28 hours every week or two.
Paleo: 7 hours, every single night, at the same time, and I feel wonderful
So, overall, I'm probably getting more sleep, but it's regular, quality sleep. And surely everyone would agree that an increase in my previous amount of sleep is an improvement?