DS, 22 months, has slept pretty well for the majority of his life but last week suddenly started to waking at 3am, shouting and crying, and refused to go back to sleep. This pattern has continued every night since. We have cut out daytime nap but this has done no good. We have also left him to cry but he will carry on for at least an hour, stop for a bit and then start again half an hour later.
What has happened? He is like a different baby...and we are all extremely tired! And ideas very gratefully received!