skip to Cookie NoticeSkip to contents

Your health and safety remain our top priority: Learn about our Safe Care Commitment | Use our Prescreen app before arrival for faster entry | Read the COVID-19 Vaccine FAQs

Header Skipped.

Circadian Rhythm Disorders

Circadian rhythm disorders are the result of the mismatch between the external environment and our internal biological clock. This clock is the pacemaker system that controls many different bodily functions during a 24-hour period and regulates when we sleep and when we wake up. Jet lag is one of the most common circadian rhythm disorders. It occurs after a plane flight that crosses several time zones so that your body clock thinks it is in your departure time zone, but you are actually in another time zone. Symptoms of jet lag may include excessive sleepiness, lethargy, insomnia, headache, loss of appetite, gastrointestinal problems, and irritability or mild depression.


For over a century, a leader in patient care, medical education and research, with expertise in virtually every specialty of medicine and surgery.

About BWH