Which neurotransmitter's reduced levels would decrease the amount of sleep?

Dopamine plays a significant role in regulating wakefulness and sleep. It is primarily involved in promoting alertness and arousal, and reduced levels of dopamine can lead to increased difficulty in maintaining wakefulness and decreased sleep quality.

The presence of dopamine enhances wakefulness and can suppress non-REM sleep. When dopamine levels are low, individuals may experience more difficulty in falling asleep or staying asleep, which could contribute to overall sleep disturbances. Understanding this relationship is crucial in polysomnography as it helps in assessing sleep disorders and their management, indicating that a decrease in dopamine would be likely to result in less sleep or poor-quality sleep.