My 18 month olds sleep is so awful right now. Either awake 5-6 times a night, or waking once for 2+ hours and won't go back in the cot. DH and I manage it between us but both of us are completely exhausted. We have an older child who wakes most nights too, and both always want mummy, so if they wake at the same time then someone is left upset while I sort the other.
I remember my eldest had a period of absolutely horrendous sleep between 14-18 months so I'm guessing this is the same regression or whatever it is.
Don't even know why I'm posting, we've been up with her an hour and DH and I have just swapped for a second time. I just need a reminder that at some point it will be over and I will sleep again!