DS2 is 2.6 and has been out of nappies in the daytime for three weeks, and is fine at going to the toilet in the day. He's still in pull-ups at night but these are usually dry in the morning, however for the past few nights he has been waking and demanding to go for a wee at 3am. He's too little to get to the toilet by himself so I've had to go with him and I'm knackered! Any suggestions for dealing with this before it becomes a very wearing habit?