As individuals age, they need fewer hours of sleep. This is MOST likely due to changes in the levels of the neurotransmitter:

Name: As individuals age, they need fewer hours of sleep. This is MOST likely due to changes in the levels of the neurotransmitter:
Brand: Quizplus
Rating: 4.8 (54 reviews)

Question

Quizplus · Accepted Answer

Serotonin levels are associated with sleep regulation, and changes in its levels can affect sleep patterns, including the need for fewer hours of sleep as individuals age.

As Individuals Age, They Need Fewer Hours of Sleep