She should stop waking on her own and instead wait for her parent, who has become her alarm clock. 3. As you add 15-minute increments between wakings, she learns to sleep for longer periods of time. Eventually you phase out the wakings altogether and find that your baby is sleeping through the night.
Usually, REM sleep happens 90 minutes after you fall asleep. The first period of REM typically lasts 10 minutes. Each of your later REM stages gets longer, and the final one may last up to an hour. Your heart rate and breathing quickens. You can have intense dreams during REM sleep, since your brain is more active. Babies can spend up to 50% of their sleep in the REM stage, compared to only about 20% for adults.
You need to sleep eight to 10 hours continuously to cycle through these stages three to four times. Every time you cycle the length of the REM sleep increases while the deep NREM decreases until you have a good 30 minutes in dream sleep without any deep sleep occurring, that is considered healthy sleep.