“A good rule of thumb is every couple of hours take fifteen minutes off. Naps are also very helpful, short naps.”

—  Daniel Levitin

Even a ten or fifteen minute nap in the middle of the day can be the equivalent of an hour and a half of extra sleep the night before, and it can raise your effective IQ by ten points.
Talks at Google (Oct 28, 2014)

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Daniel Levitin 76
American psychologist 1957

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Daniel Levitin photo

“A good rule of thumb is every couple of hours take fifteen minutes off. Naps are also very helpful, short naps. Even a ten or fifteen minute nap in the middle of the day can be the equivalent of an hour and a half of extra sleep the night before, and it can raise your effective IQ by ten points.”

Daniel Levitin (1957) American psychologist

Talks at Google (Oct 28, 2014)

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“If every cigarette you smoke takes seven minutes off of your life, every game of Dungeons & Dragons you play delays the loss of your virginity by seven hours.”

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“If you act like you've only got fifteen minutes, it will take all day. Act like you've got all day, it will take fifteen minutes.”

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“If I am to speak ten minutes, I need a week for preparation; if fifteen minutes, three days; if half an hour, two days; if an hour, I am ready now.”

Woodrow Wilson (1856–1924) American politician, 28th president of the United States (in office from 1913 to 1921)

As quoted in The Wilson Era; Years of War and After, 1917–1923 (1946) by Josephus Daniels, p. 624. Referenced in "Bartleby.com" http://www.bartleby.com/73/1288.html
1920s and later

Diogenes Laërtius photo

“Epimenides was sent by his father into the field to look for a sheep, turned out of the road at mid-day and lay down in a certain cave and fell asleep, and slept there fifty-seven years; and after that, when awake, he went on looking for the sheep, thinking that he had been taking a short nap.”

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Epimenides, 2.
The Lives and Opinions of Eminent Philosophers (c. 200 A.D.), Book 2: Socrates, his predecessors and followers

“Most of us saw our therapists every day. Cynthia didn’t; she had therapy twice a week and shock therapy once a week. And Lisa didn’t go to therapy. She had a therapist, but he used her hour to take a nap. If she was extremely bored, she’d demand to be taken to his office, where she’d find him snoozing in his chair. “Gotcha!” she’d say. Then she’d come back to the ward. The rest of us traipsed off day after day to exhume the past.”

Susanna Kaysen book Girl, Interrupted

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“Homework is not an option. My bed is sending out serious nap rays. I can't help myself. The fluffy pillows and warm comforter are more powerful than I am. I have no choice but to snuggle under the covers.”

Laurie Halse Anderson Speak

Source: Speak

“I did think about giving up smoking, but I decided not to, because I'm not a quitter. And I know that every cigarette I smoke takes five minutes off my life, but I also know it takes ten minutes to smoke it. That's a clear five-minute net gain, I reckon.”

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“To appreciate heaven well
'T is good for a man to have some fifteen minutes of hell.”

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Gone with a handsomer Man, reported in Bartlett's Familiar Quotations, 10th ed. (1919).

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