Our two and a half year old has started night waking and coming into our bed. We've let it slide but are all suffering from poor sleep now.
MIL said when DP and his brother did this she would pick them up and pop them on the loo before she went to bed herself. She said they didn't fully wake but they had a wee (which she assumed was what was waking them in the night) and stayed down all night. She swears by it and said it worked for them.
I'm sure I've read of similar where parents went in just before they went to bed themselves and 'gently' woke their toddler. Not enough for a full wake but enough to break their sleep cycle.
Yes, he usually did sleep well for the rest of the night, occasionally he would wet the bed around 6am but we could usually identify that he had drunk more than normal the night before. If we didn't lift him when we went to bed he would be wet by 1am.