I wouldn't have thought prop, she's been an independent sleeper so long. It's been on and off for a few weeks here, periods of no NWs then some odd ones again. The other night she even told me Mummy I just can't sleep! I'm just doing what it takes right now, not over-doing it but if she needs me to stay for a few minutes until she relaxes I do that. If it's just developmental and needing some extra reassurance I'd think things should settle within a few days-weeks.