DD is now 7 months old and given that she has only been sleeping for about 45-90 mins at a time during the night for the past week or so (she's never been a great sleeper - always woken two or three times a night) and feeding her back to sleep has been taking longer and longer, we've decided to try controlled crying. We started at 7 and fully expected it to take and hour, but its now 8:20 and she isn't giving up. She had a big dinner, a couple of ounces of formula and a full breastfeed. The room is not too hot or too cold. Does it just take this long? It's so much hard than I thought it would be...