When babies go through transitions in sleep cycles, they often cry out for a minute or two but they're really asleep. My son does this about twice a night. For a week I would hear him cry and go downstairs to his room only to find that by the time my hand got to his doorknob, he'd already stopped crying. After a while, I just stopped getting out of bed, lol. So this is a possible explanation. The other explanation, is that around 4 months I found that naps were interupted by what "Babywise" (otherwise known as the worst baby book on the planet, but I read it when I was pregnant and not thinking of being AP and the term stuck with me) calls the "45 minute intruder." As the name suggests, the 45 minute intruder is crying at around the 45 minute mark into an otherwise good nap. For what it's worth, Babywise says that this is often caused by hunger so their advice is to feed them and help them back to sleep in order to get a longer, more restorative nap.The reason wy this ahppens at around 45 minutes is because the infant sleep cycle is only around 40 minutes long, so basically they hit the lowest part of their sleep cycle and then realize they're hungry and call out for food. I found everything the Babywise book said to be a pile of BS, except for this one tip. There were definitely times when my baby fell asleep and then woke up 45 minutes in, ate, and then went back to sleep.
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