My 5.5 month old cannot self settle I have to rock and cuddle her to sleep and put her down once properly asleep. Up until a few weeks ago this wasn't a problem as she slept 10-11 hours through the night. However she is now waking every 1-2 hours, sometimes even more frequently and it takes ages to get her back to sleep, half the time she wakes up again as soon as she's put down and we're back where we started! is this normal?! please help am so so sleep deprived 