night dryness - when to expect it

jetgrrrl

My almost four-year-old has been potty trained for nearly a year (although he has occasional accidents) but he has never once been dry through the night. Any idea when this should happen? By contrast, our neighbor's daughter, same age, has not worn a diaper since last June. I'm a little frustrated. DH suggests we put him to bed without a diaper, which I think is absurd since obviously, he's just going to wet the bed if he's never made it through the night without a diaper! Anybody know what the guidelines are around this - should I be talking to my doctor about it?