To keep this brief: DS has been a champion sleeper from 4 weeks old, working gradually from sleeping midnight - 6am up to 7pm - 7am by the time he was about 6 months until about 2 weeks ago. He has had the same bedtime routine from 4 weeks, bath (every other night normally), pyjamas, bottle, story (or In the Night Garden), bed with a dummy and his favourite bear.
Now, he either sleeps for a few hours and then wakes up screaming, after which he wakes up screaming every 40-60 minutes for the rest of the night, or he just doesn't go to sleep at all and just screams and screams until we get him up again and bring him back downstairs (when we have another story and a cuddle and try going to bed again).
He sleeps in his own room. We've tried him with and without a nightlight, in and out the sleeping bag, tried giving him calpol in case it's his teeth that are bothering him... nothing works except getting back up. Eventually he gets so over tired that he doesn't even want picked up, he screams if we pick him up and screams if we don't.
He naps for about 1-2 hours during the day, sometimes 1 nap, sometimes 2.
Any advice would be welcome - or is it just a phase that he'll grow out of?