Why don adults wake up like babies do then?
When most adults wake at night they commonly turn over or may open their eyes momentarily and then go straight back sleep again. This process is facilitated by the fact that they usually fall asleep in the same situation in which they are likely to wake during the course of the night. Also most animals have an inbuilt sense of time and seemed to know approximately how long they may have been asleep and approximately what time it is. It is not easy to wake animals when they are in the phase of deep sleep but it is much easier to wake them in one of the light phases. This means that if any time you are trying to manipulate your baby’s sleep pattern, you would do better to try to wake them in one of the light sleep phases so that they do not wake miserable and cross.