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  2. Child development - Wikipedia

    en.wikipedia.org/wiki/Child_development

    Also called "development in context" or "human ecology" theory, ecological systems theory was originally formulated by Urie Bronfenbrenner.It specifies four types of nested environmental systems, with bi-directional influences within and between the systems; they are the microsystem, mesosystem, exosystem, and macrosystem.

  3. Sleep disorder - Wikipedia

    en.wikipedia.org/wiki/Sleep_disorder

    An estimated 17.3% of kids between 3 and 13 years old experience confusional arousals. [62] About 17% of children sleepwalk, with the disorder being more common among boys than girls, [62] the peak ages of sleepwalking are from 8 to 12 years old. [62] A different systematic review offers a high range of prevalence rates of sleep bruxism for ...