HOW YOUR BABY SLEEPS

Even before birth your baby's day were divided between periods of sleep and wakefulness. By the eighht month of pregnancy or earlier, her sleep periods consisted of the same two distinct phase that we all experience:

• RAPID EYE MOVEMENT(or REM) SLEEP, the times during which she does her active dreaming. During these periods her eyes will move beneath her closed lids, almost as if she were watching a dream take place. She may also seem to startle, twitch her face, and make jerking motions with her hands and feet. All are normal signs of REM sleep.

• NON-REM SLEEP, which consists of four phases: drowsiness, light sleep, deep sleep, and very deep sleep. During the progression from drowsiness to deepest sleep, your baby becomes less and less active, and her breathing slows and becomes very quite, so that in deepest sleep she is virtually motionless. Very little, if any, dreaming occurs during non-REM sleep.

At first your newborn will probably sleep about sixteen hours a day, divided into 3 or 4hours naps evenly spaced between feedings.

Each of these sleep periods will include relatively equal amounts of REM and non-REM sleep, organized in the following order:

1. Drowsiness

2. REM sleep

3. Light sleep

4. Deep sleep

5. Very deep sleep

After about 2 to 3 months the order will change, so that as she grows older she cycles through all the non-REM phases before entering REM sleep. This pattern will last into and through adulthood. As she grows older the amount of REM sleep decreases, and her sleep will become generally calmer. By the age of 3, only one-third or less of total sleep time is spent in REM sleep.