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Four-year-old alex is experiencing sleep problems. based on research reported in 2010, alex's difficulties could lead to attention problems that may persist into early adolescence.

What is adolescence ?

Adolescence is a stage of physical and psychological development that typically occurs between puberty and maturity (from the Latin adolescere, "to mature") (typically corresponding to the age of majority). Although adolescence is typically thought of as occurring during the teenage years, its physical, psychological, or cultural manifestations can start earlier and last longer. Nowadays, especially in females, preadolescence is when puberty usually starts. Cognitive development and physical development can continue until the early 20s, especially in males. Adolescence can only be roughly defined by age, and academics do not agree on a standard description. Years 10 to 19 are traditionally included, however an expanded definition accounts for ages 10 to 24 to accommodate for a more thorough grasp of this stage of life.

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