Epinephrine, also known as adrenalin or adrenaline, is a hormone, neurotransmitter and medication. Epinephrine is normally produced by both the adrenal glands and certain neurons. It plays an important role in the fight-or-flight response by increasing blood flow to muscles, output of the heart, pupil dilation, and blood sugar.
Anyone I have ever known has had the advice that we should never go to sleep angry. But did you ever wonder why? A new study in the journal of Social, Psychological, and Personality Science has shown that if you go to sleep angry or with an unresolved issue can massively impact your sleep quality.