Do I ride it out and put it down to the 18 month sleep regression?
DD2 has never slept without waking, but has always been able to get herself to sleep alone for bedtime and naps (with dummy). I've always responded to her quite quickly at night as DD1 is a light sleeper and finds it hard to get back to sleep after being woken by DD2's crying. In the past this has meant sometimes bringing DD2 into bed with us when she won't settle with hug/water etc. Recently she has gone down fine at 7, but then woken between 10 and 12 and refused to settle unless in bed with me. I cracked the other night and decided to leave her and see what happened. She cried on and off for 2 hours before I gave up and brought her in with me. It was whiny crying, and she would cry for a minute or two, then go quiet for about 10 minutes, then start again. Last night I thought I'd try just sitting in her room for as long as it took and then leaving. I thought it was working as she seemed to go to sleep quite quickly, but she wasn't really asleep, as every so often she'd open her eyes to check I was still there, and if I tried to leave she would start bawling.
Sorry for the essay. Basically my question is: Should I persevere with some kind of sleep training (be it gentle or leaving to cry), or just suck it up as a sleep regression and see how she's doing in a month or so?