Up until recently DS (2.4) has been pretty good at bedtime. Most nights he'd just chatter to himself until he fell asleep and occassionally he'd get up and have to be returned.
The last few weeks he's been getting out of bed half a dozen or so times before settling, which I could cope with. But the last few nights he's gone utterly bonkers. He's tired, goes through bedtime routine fine. Then as soon as he's put to bed he's bouncing off the walls. Immediately jumping up, bouncing up and down the bed, laughing his head off. It's like he's had a sudden massive hit of redbull.
I've tried everything I can think of, short of tying him to the bed. What on earth is going on and what do I do to make it stop?