Sleep
Learning Center
Ovarian cysts and infertility: A connection?
Certain types of ovarian cysts can contribute to fertility problems.
Obstructive sleep apnea
Learn the signs that point to this common and potentially serious sleep disorder. And find out the treatments that can help you sleep better.
Nasopharyngeal carcinoma
Nasopharyngeal carcinoma is cancer that occurs in the nasopharynx, which is located behind your nose and above the back of your throat.
Napping: Do's and don'ts for healthy adults
Napping can benefit your health. Find out how to make the most of a nap.
Multiple sclerosis
This nervous system disorder causes a range of symptoms — and while there's no cure, it's possible to have long periods of remission.
Mononucleosis: Can it recur?
Mono can return in some rare cases. Learn why that happens.
Microcephaly
Learn more about microcephaly, when an infant's head is smaller than expected. The condition affects child development.
Melatonin side effects: What are the risks?
Melatonin is generally safe for short-term use but can cause side effects.
Mayo Clinic Minute: Sleep Spoiler - Tips for a Good Night's Rest
Follow these tips for a good night's sleep.
Masculinizing surgery
Find out how masculinizing surgical procedures can help better align the body with a person's gender identity.
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