I find what works really great for me at this moment is having a special sleeping bag for them, I get it out lay it on the floor and my dck is really excited about getting in her own special sleeping bag to watch one hour of tv, then they always fall asleep at 2-2:15, I find they just are not ready at 1 like the babies. If I would like her to nap that day I turn the tv off at 2 and say I would like you to try and sleep. They understand getting out of the bag is not allowed. This way I still have my 2 hrs, which like fruit loop I'm not giving up either! 3 year olds need even a half hour to an hour of nap because believe it or not this will help them go to sleep at night, their not wired from being so tired from the day. Mine sleeps on the family room floor where I am usually doing my housework so I can always see her. This works well for me and I ususally keep the tv on teletoon.
You can buy great sleeping bags on sale Bob the builder, Dora, whatever, they love it and will not leave it if you make it clear this is lay down time.