Examlex
The more massive planets in the solar system tend to be less dense than the lower mass planets.
Excessive daytime sleepiness
A condition characterized by persistent sleepiness and often a lack of energy, even during the day after adequate or prolonged nighttime sleep.
Adolescent
A young person in the stage of development between childhood and adulthood, typically between the ages of 13 and 19.
Sleep needs
The amount of sleep required by an individual to maintain optimal health and function.
Central nervous system
The part of the nervous system consisting of the brain and spinal cord, responsible for processing sensory information and controlling responses.
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