Happiness fact 22: grade A students had 15 min more sleep than grade B

Dr. Kyla Wahlstrom of the University of Minnesota surveyed more than 7,000 high schoolers in Minnesota about their sleep habits and grades.

eens who received A's averaged about fifteen more minutes sleep than the B students, who in turn averaged eleven more minutes than the C's, and the C's had ten more minutes than the D's.

Wahlstrom's data was an almost perfect replication of results from an earlier study of more than 3,000 Rhode Island high schoolers by Brown's Mary Carskadon.

Certainly, these are averages, but the consistency of the two studies stands out. Every fifteen minutes counts.

Source: Dr. Kyla Wahlstrom of the University of Minnesota, USA (2007)

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Happiness fact 21: active lifestyle increases telomere length by 10%

A 10% in healthy Lifestyle Changes Might Reverse Cell Aging, Study Suggests. They found that telomere length actually increased among the men who were assigned to undergo the lifestyle intervention, by an average of 10 percent. Meanwhile, telomere length decreased by an average of 3 percent among the men not assigned to a lifestyle intervention.

Telomeres are the "caps" that protect the ends of chromosomes, similar to how shoelaces have plastic caps to stop them from fraying. Shorter telomeres have been linked in previous research with cell aging and increased risks of age-related diseases like cancer and dementia, as well as premature death.

Source: The Huffington Post | By Amanda L. Chan (2013)

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Happiness fact 20: practice and remember