What is “normal” sleep?
A good night’s sleep is when you fall asleep quite easily, do not fully wake up during the night, do not wake up too early, and feel refreshed in the morning. Regularly having difficulty falling asleep or sleeping through the night is not normal for healthy people of any age. But not everyone needs the same amount of sleep, and quality of sleep is different in different phases of life.
Young children and older people sleep more lightly than adults and teenagers. The length of time spent in deep sleep phases changes over a person's lifetime. Babies and toddlers need to sleep a lot more than older children and adults. By the time they reach the age of five, most children have the typical sleep patterns of an adult: they are awake during the day and then sleep through the night. The amount of time spent sleeping gradually decreases until the age of 80.