Which class produces sleep by depressing the central nervous system?

Which class produces sleep by depressing the central nervous system?

• A. Stimulant
• B. Hypnotic
• C. Antidepressant
• D. Antipsychotic

Answer: (B)

Sleep is produced when brain activity is dampened, so drugs designed to reliably induce sleep are classified as hypnotics. Hypnotics work by enhancing inhibitory signals in the brain, most commonly boosting GABAergic transmission at GABA-A receptors. This increases chloride influx, hyperpolarizes neurons, and slows CNS activity, leading to sedation and the onset of sleep. Stimulants, by contrast, raise CNS activity and promote wakefulness, not sleep. Antidepressants act primarily to modify mood and neurotransmitter balance, and while some can cause sleepiness as a side effect, their main action isn’t to depress the CNS to produce sleep. Antipsychotics block dopamine receptors and can cause sedation through other receptor effects, but their primary purpose isn’t to induce sleep via CNS depression. The class best described as producing sleep by depressing the CNS is hypnotics.

Sleep is produced when brain activity is dampened, so drugs designed to reliably induce sleep are classified as hypnotics. Hypnotics work by enhancing inhibitory signals in the brain, most commonly boosting GABAergic transmission at GABA-A receptors. This increases chloride influx, hyperpolarizes neurons, and slows CNS activity, leading to sedation and the onset of sleep.

Stimulants, by contrast, raise CNS activity and promote wakefulness, not sleep. Antidepressants act primarily to modify mood and neurotransmitter balance, and while some can cause sleepiness as a side effect, their main action isn’t to depress the CNS to produce sleep. Antipsychotics block dopamine receptors and can cause sedation through other receptor effects, but their primary purpose isn’t to induce sleep via CNS depression. The class best described as producing sleep by depressing the CNS is hypnotics.