Hi, this may not qualify as a "problem" in that my DS (aged 2.5 years) is able to go to sleep on his own, but in the last 2 months or so he has spent between 1 and 2 hours every night - after being put in his cot - laughing. Not little giggles, but proper full on laughing and shrieking.
We've got one of those video monitors and keep an eye on him during this: he's perfectly happy. But it's "weird" behaviour and I wondered if (a) there is something to be done and (b) if anyone else has experienced it?
He is also waking earlier than usual, again laughing to himself. We can leave him for an hour in his cot and he's totally happy about it.
For a child that used to go to sleep at 8pm and not wake until 9am/10am every day, plus have a 2 hour afternoon nap, this is quite different behaviour. We put him to bed at 8pm and he's often not asleep until 10pm, waking now at 6:30am. Sleep is important developmentally (and for our sanity!) and he's losing 4-5 hours a day versus what he used to get.