Cleveland Clinic’s Health Library provides information about diseases, conditions, treatments and body systems to help answer questions you may have about your health — from the everyday to the complex.| Cleveland Clinic
Learn more about our voice, writing process and commitment to all readers.| Cleveland Clinic
Melatonin is a natural hormone that’s mainly produced by the pineal gland in your brain. It plays a role in managing your sleep-wake cycle and circadian rhythm.| Cleveland Clinic
Sleep apnea can affect your overall health, more than just your sleep. Learn about the types and treatment options.| Cleveland Clinic
Cleveland Clinic advertising supports our core mission and helps us improve our site as a resource for trusted health content. Learn how to advertise with Cleveland Clinic.| Cleveland Clinic
Insomnia is when you don’t get enough quality sleep, affecting how you feel and function during waking hours. It’s usually not dangerous and is typically treatable.| Cleveland Clinic
Cortisol is a steroid hormone that your adrenal glands release. It affects several bodily functions and mainly helps regulate your body's response to stress.| Cleveland Clinic