I'm using pull up diapers at night. She nearly always wakes up dry and uses the potty in the morning. I keep telling her that she can wear her big girl underwear to bed if she sleeps in her own bed (you know, the one with the waterproof mattress), but she'd rather wear a diaper of any kind and sleep in mine.
We still have regular diapers in her size, but she does struggle to get those off in time sometimes, so the pull ups are the way to go for us. I reuse them, too, since she rarely has an accident and only uses them at night.
Jo
DD#1 "JellyBean" 6/08
DD#2 "Ha" 6/10
"Theory is great, but as I'm in the trenches of diapers and dishes and ear infections, I try to relax and focus on what's most important: love."--mjs64