I have experimented a lot with different kinds of sleeping patterns. There is a section in The 4 Hour Body by Tim Ferriss that first introduced me to various levels of polyphasic sleep schedules and Steve Pavlina's Blog on the subject provided me loads of information as well.
My own experience has been that it takes time to get used to. Just with sleep in general I find that if I sleep 10hours monophasically even for just a few days in a row, I feel tired if I don't get my 10hours in. Similarly if I start napping during the day and sleeping less at night, it takes time to adjust; it isn't a switch you can just turn on/off. I would give it two weeks and see how you feel.
When I started experimenting I was very disciplined at getting out of bed when the alarm went off. Two main strategies really helped me out: 1) I had my alarm far enough away from the bed that I had to get out of bed to turn it off, 2) I had something very specific in mind that I was going to do when I woke up, and it was something I was actually looking forward to doing.That said, for the first week or two I had a big drop in productivity - I was in an adjustment phase and was tired. Steve Pavlina talked about this extensively in his blogs though so I was expecting that, and I was also expecting it to end shortly.
Overall I think it is really worth it. I am sleeping around 6 hours a day now with two short naps during the day and one long sleep at night. This isn't much less than average, but the biggest benefit I find is that I'm never really drowsy. I find the naps really refreshing and allow me to work harder during the hours I am awake. I also find that I've trained myself to fall asleep very quickly. When I was monophasically sleeping, at times I'd find it really hard to actually fall asleep, but when you only have a small finite time to sleep you become much more efficient at falling asleep.
It should also be noted that Piotr Wozniak from Supermemo is heavily critical of polyphasic sleeping and claims it has serious impacts on performance and memory. It hasn't been my experience, but take it for what you will.