My littlest is now 17 months old and has slept through probably twice! 
it's different every night- sometimes she's wants a cuddle, a drink, her blankey or mostly it's nothing and she sometimes doesn't even want picking up.
She has a short but consistent bed time routine but is still sharing our room (she's in her own cot I don't co sleep- wish I blooming could sometimes!!) We planned on putting her with our biggest (8yo) but I can't risk messing with his sleep as he has school! She wakes up a lot in the evening before we have even gone up so I'm not convinced that's the entire problem but I have no idea what her issue is.
The rooms well ventilated (she's a very hot sleeper), we have a fan for white noise and a black out blind. We have tried a night light and that seemed to make it worse. Tried leaving her to it but she'll just keep screaming and get very distressed. We have also tried a dummy but she uses her teeth to rip them apart lol!!
She does rely on a bottle to get her back to sleep sometimes but again it's not consistent enough for me to think that's the problem!
I'm getting to my wits end I've tried all the usual stuff but nothing makes a difference she is still up anywhere between 2 and 10 times a night! And it's almost impossible to ignore her in the night when your in the same room and she's literally waking the whole house!!
Any suggestions on what else I could try would be very welcome! Do you think it's worth trying her in with my son?
Also how much sleep/ what bedtime does your LO have? She goes up to bed about 6/7. She can't last much longer than that because she's always tired. Not only does she wake a lot, she's normally up between 4 and 6!
Should I let her sleep as much as she wants in the day? Or limit it? I've tried both sporadically and neither seemed to make much difference but should I try one or the other for longer?
I feel like a new Mum without a clue with this kid so I'm willing to try anything!!!!