I'm a champion sleeper, I can sleep and sleep some more. Then I'll usually sleep again shortly thereafter. I'll sleep at night, I'll sleep during the day, it doesn't matter what time it is, I will have no problem going to sleep. In fact a client at work once asked me when I am happiest and I responded, "When I'm asleep".
I love naps. I sleep so long during a nap that I'm often more tired than I should be when I wake up, but I also struggle to nap for short periods of time. Usually it's between two and three hours. And I also usually don't have any trouble falling asleep that same night. I like to nap on my giant couch, but have no problem napping in bed either.
Often times on my days off I'll take a nap, not because I'm tired, but simply because I can. A few weeks ago on one of my days off, I took two naps. I remember that day, it was a good one. I had woken up early for me, probably like 9:00am or so, and by 11:00, I was feeling tired and took my first nap of the day for about an hour and a half. When I woke up, I did a few errands and then found myself quite sleepy again in the afternoon. That's when I took my second nap, this one lasting just over an hour. What a fantastic day. I hope to have more two-nap days in the future. One is great, but two is like nap time heaven. Next day off maybe I'll shoot for three naps. Wow, I just blew my own mind with that, I'm feeling sleepy from all this brain work. Looks like it's time for a nine hour nighttime nap.