[Phytotherapeutic drugs and sleep]

Area of Science:

• Integrative medicine and sleep science.
• Neuroendocrinology and psychopharmacology.

Context:

• Phytotherapeutics are increasingly studied for their effects on sleep, with most evidence focusing on subjective improvements.
• Hypericum extract (LI 160) has shown to induce slow wave sleep in older adults.
• Major depression (MD) is often characterized by sleep disturbances and hypersecretion of glucocorticoids.

Purpose:

• To investigate the effects of hypericum extract (LI 160) and Ginkgo biloba extract (LI 1370) on sleep structure in patients with major depression.
• To explore the potential neurophysiological and neuroendocrine mechanisms underlying these effects, particularly concerning the hypothalamic-pituitary-adrenal axis.

Summary:

• A six-week therapy with hypericum extract (LI 160) increased slow wave sleep in patients with major depression.
• Adjunct therapy with Ginkgo biloba extract (LI 1370) also demonstrated an increase in slow wave sleep in the same patient group.
• LI 160 is known for improving depressed mood, and LI 1370 for cognitive function, suggesting multifaceted therapeutic benefits.

Impact:

• Provides evidence for the efficacy of specific phytotherapeutics in modulating objective sleep parameters (slow wave sleep) in a clinical population.
• Suggests a potential role for these natural extracts in managing sleep disturbances associated with major depression.
• Highlights the relevance of the "extended two process model" of sleep regulation in understanding the interplay between phytotherapy, sleep architecture, and the hypothalamic-pituitary-adrenal axis.