We've had a problem with split nights coming and going since she was 17 months old. She's now 3 years 1 months. Sometimes there were no split nights for two months, sometimes none for a week, sometimes up to 4 within a week. No consistency at all, and she's now had at least 10 consecutive split nights in a row, awake for 2 - 3 hours in the night, talking or singing to herself but also asking to use the potty (sometimes not doing a wee at all) or asking for a nappy change (definitely can't be left without nappy at night yet, is wet every night still although potty trained in the day). We used to be able to improve the split nights by shortening naps, but she stopped napping 6 months ago. I think we are just really unlucky and that developmental phases hit her hard and result in split nights, but my gawd is it killing us. She was having them intermittently until about a month ago when she suddenly started sleeping for longer than usual, hiding had been doing 10.5 hours but was suddenly doing in excess of 12 hours and sleeping through the night again which was AMAZING, then all of a sudden they became split nights instead. They are affecting her badly as we are having to wake her for nursery as she's been awake so long at night that she's sleeping in. I can't get back to sleep after her split nights so I'm sometimes having to go to work or parent her having been up since 1.30am so this is really starting to affect my mental health. When i Google 3 year old split nights i get a lot of hits, when i Google 4 year old split nights I get way less hits. Please someone tell me this will go away with time! We've not got any more day sleep to cut down as there is no nap so we are a bit stuck. . . .