Excessive sleepiness, particularly excessive daytime sleepiness, is the hallmark sign of hypersomnia. Hypersomnia can also be characterized by prolonged sleep at night. Up to 40 percent of people experience symptoms of hypersomnia at one time or the other, reports WebMd. Some people inflicted with this sleep disorder have trouble functioning at work and school and interacting with family, friends, and in other social situations.
Happiness may not come from your family, friends, or wealth, at least according to a new study. Rather, it comes from a peptide.
Led by the University of California Los Angeles, an international team of researchers has linked levels of hypocretin (a human peptide and neurotransmitter) to happiness. They found that the levels of hypocretin soared when we are happy, and also decreased when we are sad.