My 17mo son has slept through the night since 4 months. He normally sleeps 6.45pm-7am. We put him in his cot awake after his bath, milk and cuddle time and he always just goes straight of to sleep no problem. Up until a couple of weeks ago.
For the last 2 weeks he has been waking up throughout the night, normally between 3-5ish. He stands himself up in his cot and just cries and screams. I have been going in and laying him back down and he will sleep for 15 mins or so then get back up and do the same thing again. Over and over again! Last night I was up 17 times 
Anyone else experienced this and have any advice? I'm so tired and need to break this habit he has got himself into!