Help - my DD is waking at midnight or so and chatting and singing for 2-4 hours seeming quite happy although there is the odd crying out for attention .. have tried leaving her, going in and shushing her, changing nappy, calpol in case teething ... but nothing works - has just had four teeth in and a new baby bro to boot ... can I hope this will end naturally or is there something I can do to get her back to sleep (becoming very hard work during the day) ...