officially potty trained?

I think our son may be through with the night time pull-ups.  If you have been following our quest for a full night's sleep you know that due to his 2:00am wandering through the house we have been locking him in his room at night.  He has never complained or cried about it - which has been a blessing AND it seems he is now sleeping until morning.  This morning around 6:30am I heard him playing and singing.  I wasn't quite ready to get out of bed so I turned the monitor down to low so I could catch another 20 minutes of shut eye.  It seemed sensible, right?  When my husband went upstairs to get G ready for preschool he found a happy but naked boy waiting for someone to wipe his bottom.  With a need to relieve himself he had stripped off his pajamas and pull-up, found a plastic sand bucket in his closet and well, you can imagine the rest.  Hmm...I think we will NOT lock his door tonight to see what happens.