Select the appropriate treatment modalities for a client with circadian rhythm sleep-wake disorder.

Choice A reason: Circadian rhythm sleep-wake disorders are caused by a misalignment between the internal biological clock and the external environment. Melatonin acts as a chronobiotic to shift the phase of the circadian pacemaker, while chronotherapy involves progressively delaying or advancing sleep times to reset the sleep-wake cycle. These interventions directly address the underlying desynchrony, making them the gold-standard physiological treatments for this specific classification of sleep disorders. Choice B reason: Alprazolam is a benzodiazepine that primarily treats acute anxiety or short-term insomnia by enhancing GABAergic neurotransmission. While it may induce sedation, it does not correct the underlying circadian misalignment. Cognitive therapy is helpful for the psychological components of insomnia, but it is not the primary modality for resetting a disrupted biological clock compared to light therapy or chronotherapy. Choice C reason: Valerian root is an herbal supplement with mild sedative properties, but it lacks sufficient clinical evidence for effectively shifting circadian phases. A sleep diary is an essential diagnostic tool used to track sleep patterns over several weeks, but it is a data-collection method rather than an active treatment modality. It identifies the rhythm disruption but does not therapeutically resolve the circadian shift. Choice D reason: Doxepin is a tricyclic antidepressant approved for sleep maintenance insomnia at low doses, and paradoxical intention is a cognitive-behavioral technique used to reduce performance anxiety related to falling asleep. Neither of these treatments addresses the core pathology of circadian rhythm disorders, which requires synchronization of the suprachiasmatic nucleus with the desired environmental sleep-wake schedule.