Which drug is known to induce hypnosis and sleep by acting on the centers for wakefulness?

Prepare for the DAANCE Module 3 Exam with flashcards and multiple-choice questions. Each question comes with hints and explanations. Ensure your success!

Induction of hypnosis is achieved by shutting down the brain’s wakefulness network, particularly the reticular activating system, to rapidly quiet arousal and consciousness. Methohexital is an ultra-short-acting barbiturate that enhances GABA-A receptor activity, increasing chloride influx and strongly inhibiting neurons in the CNS. This potent GABAergic effect dampens the activity of the wakeful centers and cortical areas, producing quick loss of consciousness and sleep. Its very short duration makes it ideal for induction, allowing a smooth transition to maintenance anesthesia. Ketamine works differently through NMDA receptor antagonism, yielding dissociative anesthesia with preserved airway reflexes and mood/ventilatory effects that aren’t centered on depressing wakefulness centers. Fentanyl provides analgesia and some sedation via mu opioid receptors but does not primarily induce hypnosis by suppressing the wakefulness network.