Which neurotransmitter is associated with mood and sleep?

Which neurotransmitter is associated with mood and sleep?

• A. Serotonin
• B. Dopamine
• C. Glutamate
• D. GABA

Answer: (A)

Serotonin is the neurotransmitter that best links mood and sleep. Neurons that produce serotonin in the brainstem send widespread projections to mood-related areas like the limbic system and to regions that regulate arousal and wakefulness. This broad influence helps stabilize mood and affect emotional state. For sleep, serotonin serves as a precursor to melatonin, the hormone that governs the sleep-wake cycle, tying daytime mood regulation to nighttime sleep. Serotonergic signaling also modulates transitions between wakefulness and sleep stages through multiple receptor subtypes, reinforcing its central role in both domains. Dopamine focuses more on reward and motivation, not primarily on mood regulation. Glutamate is the main excitatory transmitter and supports fast signaling across circuits. GABA is the main inhibitory transmitter and is crucial for sleep initiation and general neural quieting, but its link to mood is not as direct as serotonin’s.

Serotonin is the neurotransmitter that best links mood and sleep. Neurons that produce serotonin in the brainstem send widespread projections to mood-related areas like the limbic system and to regions that regulate arousal and wakefulness. This broad influence helps stabilize mood and affect emotional state. For sleep, serotonin serves as a precursor to melatonin, the hormone that governs the sleep-wake cycle, tying daytime mood regulation to nighttime sleep. Serotonergic signaling also modulates transitions between wakefulness and sleep stages through multiple receptor subtypes, reinforcing its central role in both domains.

Dopamine focuses more on reward and motivation, not primarily on mood regulation. Glutamate is the main excitatory transmitter and supports fast signaling across circuits. GABA is the main inhibitory transmitter and is crucial for sleep initiation and general neural quieting, but its link to mood is not as direct as serotonin’s.