Hi, I'm sorry you haven't had any replies before now. I also found by the time the yawns started it was too late. Sometimes when LOs are getting tired the cues can be quite subtle - staring, slightly 'jerkier' or excited movements, eye rubbing etc. If you note the point at which she usually yawns then keep a close eye from 10-15 mins before that and perhaps see what you notice? How old is your LO?