we had the same thing and to be honest, it felt like I was constantly trying to get her to stay asleep so I just let her sleep for the 40 minutes. And yeah, I know what you mean when you say that she is tired an hour later but I just went with that. there were times when I felt that I was spending longer trying to get her to sleep than the time that she actually was asleep!! It really did sort itself out and now she has longer sleeps.
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