I thought so too - it worked the first time but not the other night! Well, she woke and was whingy and restless but after about 30 odd minutes of that and not being able to soothe herself even with her thumb she started crying. We listened to her for a little while and then hubby tried to resettle for quite some time and she did fall back asleep but woke shortly after he left the room. I tried, then offered some water and a cuddle and she fell back asleep in my arms so I went and lay down in my bed. Co-sleeping has never worked with either of my kids, they' rather crawl around and kick and scratch and anything but sleep

The last two nights she's woken after 30/40 minutes crying but at least has been able to resettle! then you've got a day like today which was:
WU: ? Awake at 6.20 when I checked the monitor
OOB: 6.30
Nap 1: 9.50; asleep shortly after - 11.10
Nap 2: 2.30ish - 3.30 so less than an hour
BT: 6.30. Went down crying (same as usual) and didn't fall asleep until closer to 7.00pm but at least didn't wake crying early on.
Man she's hard work! I totally can't crack her or even know what I should be doing with her!