Young children's sleep cycles are similar to adults, only shorter. After about 45 minutes, they go from a deep sleep to a light sleep and period of brief wakefulness. If they can make it through this phase and get back to sleep soundly, then you will get another hour out of them through the next cycle. Babies wake up and cry because they have not learned how to get themselves through the period of brief wakefulness like most of us adults do. Which is why it is important to help them get through the sleep cycle until they learn themselves. Some babies can teach themselves, some need CIO, and others, (like my dd), need to be shhusshed until they feel calm enough to go to sleep (those are the babies who drive everyone nuts and make you want to pull your hair out and term).

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