My five month old left the UK, a happy, settled 12 hours per night sleeper. During our 3 week stay in Australia he became very unwell with a gastro virus and ended up being admitted to hospital for three nights. Since we have returned to the UK he seems to have developed a whole new personality....he won't fall asleep on his own, he screams for hours rather than falling asleep when he's tired, he wakes three or more times per night!!, ..........any suggestions anyone.............I'm desperate!