Certified Polysomnographic Technician (CPSGT) Practice Exam 2026 - Free CPSGT Practice Questions and Study Guide

Caffeine is a well-known stimulant that can significantly impact sleep patterns. When consumed, it blocks the action of adenosine, a neurotransmitter that promotes sleep, thus making it more challenging to fall asleep. This interference with adenosine’s function can lead to a delay in the onset of sleep, prolonging the time it takes for an individual to fall asleep. Additionally, caffeine can reduce overall sleep time by increasing alertness and potentially causing awakenings during the night, leading to fragmented sleep.

The influence of caffeine on sleep is particularly notable if it is consumed later in the day, as its half-life can extend the duration of its effects. Sleep duration and quality may suffer as a result, which can have downstream effects on alertness and overall health. Therefore, the effect of caffeine is largely characterized by its ability to delay sleep onset and diminish total sleep time, making this choice the most accurate reflection of how caffeine affects sleep.