Our DS will be 24 months in two weeks. He understands the potty is for pee and poop, and has had a potty in his bathroom for a couple months now. He sits on it before bath/bed. Just recently (the past two weeks) we have been putting him in big boy underpants about an hour before his bath and telling him to sit on his potty if he thinks he needs to pee. The past few nights he has consistently peed in his potty, with a couple accidents in his underwear on his way to his potty. So the issue: He has taken his diaper off on a few occasions at night and at nap time, we check him on our video monitor before we head to bed and saw he was wrapped up in his blanket asleep, assuming his diaper was on. Next morning, come to find the diaper off and completely dry, and the bed soaked. A few times, I have caught him in the act by watching him on the monitor during his nap and at bed time. Or the one time looking at the video monitor and seeing his butt cheeks facing the camera. Solutions we have tried: When we first started having the issue of him taking his diaper off, we put him in a snap onsie and a pajama shirt, he hasn't unsnapped it until recently. Sad, but we have duct taped his diaper tabs. This worked for two days until he figured it out. Next, I put the diaper on backwards and duct taped the tabs. This worked, until this afternoon and I watched him take it off in under 3 minutes before his nap. I need suggestions as to how I can keep his diaper on? Pull ups at night since they are more like underwear? I'm out of ideas, I know he isn't ready to potty train at night since he is on the young side of potty training still.