People with heart disease often develop dreadful sleep problems, and now, scientists have identified a direct link between these conditions for the first time in a new study in mice and human tissues. 

Published Thursday (July 20) in the journal Science, the research shows that heart disease may derail the production of the sleep hormone melatonin in the brain due to damage to a group of nerves that innervate, or plug into, both organs — the superior cervical ganglion (SCG).

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