Night Training

I have a 3 year old as well. For night training -- well we praise him when he's dry in the morning and he wears pull ups at night. Don't stress about this one. Keep it positive and stick with the pull ups until he's consistently dry at night. Some kids train at night early, some late -- but this isn't something you can control (or that he can really!). You say he wants to wear undies like his big sister -- and that is good motivation for him. But take it from someone who had a REALLY hard time getting trained at night -- back off on this. If he is trained during the day then night training will come eventually.

I am a firm believer night time training comes inside internally when the body is ready. Not something you can train or really control. If the child is a heavy sleeper there is no way they can read the ques to get up and go and it takes longer sometimes. If he is only three, give him some time and save you both stress and continue pullups just at night. After two weeks of the pullups being dry when he wakes then put him in underwear. I do not believe kids can control at night until their body is ready to be there too.
I got my son up right before I went to bed the first week, had him pee and put him back to sleep. Thankfully he was fine with that and then in two weeks of being dry in the mornings we went to all night in underwear. He can go 11 hours without peeing at night. It takes time and patience though. Make sure your son has no liquids after 6pm if you can help it and have him go before bedtime.
Hang in there.

He's just not quite completely ready. Let him wear pull-ups for a while at night, and don't discuss the issue with him at all. (The discussion adds an extra layer of tension, because he wants to please you, but his body's not ready to cooperate.) You will eventually notice that the pull-ups are consistently dry. Could be a week or four months from now.

I wouldn't stress. When he's ready, he'll be ready. Last night was the first time DD slept in her undies and she wanted to start wearing undies at night. So I told her if she woke up dry for a week straight, then she can try it. So far, so good. Don't push it. Eventually, it will happen. Good Luck!

Between a little bladder and a nervous system that doesn't develop at the same rate as his growth, possibly being a deep sleeper, and being just 3, it's very normal for him to be wetting the bed at night. Remind him to go potty before he goes to bed, don't let him drink a lot right before bedtime (but don't cut back altogether on liquids - it'll be a control issue before you know it) and put him in nighttime pullups. Some kids, especially boys, don't grow out of night time wetting until they are at least 7, and there's not a lot you can do except wait for his body to get it all coordinated. Make it a non-issue to avoid more problems later on.

I had the same problems with my son. He will be 4 in December. Anyway, what we did was to make him go potty before he went to bed, didn't give him anything to drink after that. And then when I went to bed, about 10pm, I would wake him up and make him go again... He didn't like being woken up, and he usually didn't wake up all the way, AND it took a little coaching on my part to get him to pee, but it helped tremendously!!!

S., I have a 6 year old who still wears pull ups to bed. We were So very frustrated and didn't know what to do. We took him to the dr. thinking he had something wrong with him and they tested him. There is a chemical that sometimes hasn't kicked in yet. (boys are slower than girls.) and there isn't anything you can do until they are 8 years old cause of the side effect of the medicine to make the chemical come in. It is a chemical that tells the kidneys when you are asleep so you won't pee but if they don't have the chemical yet then they just pee even if you get them up every few hours in the night and limit drinks. We tried everything. Even the alarm thing and nothing seemed to help. So, when we found out about the missing chemical it is easier to just let it go that he will eventually do it. I had to buy some sheet covers that are plastic liners so I can just wipe them off with a disinfectant instead of always doing laundry. hang in there. I am sure it is normal! i know it isn't fun but be patient. Or you can have him tested.