My 2.9mo DD has been a great sleeper since 13mo (bed at 7.30/8.00pm easily, self-settling then 12-13 hours sleep). Occasionally we would have to go in to her if her dummy had dropped out of the cot, but by and large she slept straight through (or woke and self-settled without disturbing us).
Since Nov she has been taking longer to go to sleep - sometimes an hour or so - waking more frequently, and calling for us. Also doing things like demand we leave the light on, the door open, or calling that she's dropped her dummy when she hasn't or purposely throwing it so she can call us to retrieve it.
We're not really sure why (scared of the dark? Bored? Ready to drop a nap? Out of routine after a few colds then xmas? Manipulative?) or what to do about it (nightlight? Wean off dummy? Stick firmly to routine and assume it will pass?)
Is this common? Any thoughts, insight or advice v welcome!