There are two types of sleep:
REM (rapid eye movement sleep)
This is a light sleep when dreams occur and the eyes move rapidly back and forth. Although babies spend about 16 hours each day sleeping, about half of this is in REM sleep. Older children and adults sleep fewer hours and spend much less time in REM sleep.
Non-REM sleep:
Non-REM has 4 stages:
Stage 1 - drowsiness - eyes droop, may open and close, dozing
Stage 2 - light sleep - the baby moves and may startle or jump with sounds
Stage 3 - deep sleep - the baby is quiet and does not move
Stage 4 - very deep sleep - the baby is quiet and does not move
Babies may awaken as they pass from deep sleep to light sleep and may have difficulty going back to sleep in the first few months.
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source:http://askville.amazon.com/SimilarQuestions.do?req=newborn-cry-minutes-stop-crying
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