DS has been sleeping 8-6/6.30 fairly consistently (when not ill etc) since 8 months.
Last week or so, he's woken up at least once a night and usually twice. It's about half-half between him crying out but not really awake, eg eyes still closed, and sitting up shouting.
Goes back to sleep pretty easily mostly, although once or twice we've resorted to half a dose of Calpol and he's gone down instantly.
So it seems that something is waking him up, but not bothering him enough to keep him awake. Usual suspect is teething, of course, but may not be - do we ride it out or are there suggestions out there to try?