Answer:
Because of an immature Prefrontal Cortex.
Step-by-step explanation:
Adolescence is a physical and psychological transitional stage of growth that typically occurs during the period from adolescence to legal adulthood.
The prefrontal cortex is the cerebral cortex covering the front part of the frontal lobe, It receives input from many brain regions to process information, and adapts accordingly. The prefrontal cortex assists in a wide variety of executive functions.
The prefrontal cortex is a little immature in teenagers as compared to adults; it may not fully develop until your mid-20s. This attributes to them to be more likely than adults to choose to stay up all night.