Sleep schedule?

What kind of sleep schedule does your LO have? He has been waking up around 8:30, taking a nap after lunch (12:30-2ish) and going to bed at 8. But lately he hasn't been falling asleep at naptime. He'll hang out in his crib quietly but won't fall asleep for at least an hour, if at all. I'm afraid to push back nap in fear of him sleeping too late & not wanting bedtime. He's always been a really good sleeper, so I don't really know what to do. Thanks!