DS was four last Friday. For about the last ten days he has started crying every night at about 9.30-10pm-ish, around 2 hours after going to sleep.
When one of us (DH or I) go up to see him, he's usually sitting up, wailing incomprehensibly and pointing or waving his arms about. He doesn't seem to wake at all and after about 3 or 4 minutes he will lie back down and go straight back to sleep.
We don't talk about it with him and he hasn't mentioned it during the day.
I can't think of any stresses or changes in his life right now. He was hugely excited about his birthday (and party), but that's happened now.
My question: is this perfectly normal?