Can I recommend to all of you with older kids still in Pull-Ups to consider switching them to cloth "pull-ups"? They come in larger sizes or can be custom made for older children by some stay-at-home mom's who do cloth diapers and trainers. You can get them already water-proofed, or add a waterproof cover until no longer needed. Some even come as pocket-style that allows you to custom stuff it according to your child's needs. (For the record, I don't make or sell cloth diapers or trainers, but do cloth diaper my own children.)
There are a couple reasons for this suggestion:
1. It will feel more like underwear to the child and may encourage eventual night dryness.
2. Because it's not a "Pull-up" you can tell your child it's their new "special night-time underwear", thus hopefully taking away some of the embarrassment. Pull-ups, or even the big kid disposable "undies" still feel a lot like diapers.
3. When wet, they will feel the wetness all over, not just in the wet zones (that often have feel-dry liners) of the pull-ups. Again, encouraging dryness.
4. It's better on the environment, and if your child would be one of those long-term night wetters, it's better on your pocket book.
Since wetting is the only issue at night, you can very easily train your child to remove their wet undies in the morning and place them in the laundry or a bucket, and they can be washed in your regular wash. (Rinse first in the sink if desired, especially if you go more than 2 days between wash loads.)
Hope that helps.