December 27, 2020

Sleep when needed

Chronotype determines more than when you sleep and wake. It orchestrates predictable peaks and troughs of energy over the course of the 24-hour day. The so-called "window of circadian low" -- the hours when the body is least adapted for wakefulness -- typically occurs between 2 a.m. and 6 a.m. There's another, smaller dip 12 hours later, in the midafternoon.

There are also two high points, when thinking is sharp and reaction times quick. One occurs within an hour or two after waking, and the other after the daytime dip. This cycle is shifted earlier in a morning person and later in an evening or night person.

At the Denmark offices of the pharmaceutical company AbbVie, employees design work schedules that take advantage of their biological strengths.

-- Emily Laber-Warren

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April 23, 2016

Sleep much ? Top 10 reasons to sleep

1. Irritability: "Complaints of irritability and [emotional] volatility following.
2. Headaches
3. Inability to learn
4. Weight gain: People who are underslept seem to have hormone imbalances that are tied to increased appetite, more cravings for high-calorie foods, a greater response to indulgent treats, and a dampened ability to control their impulses -- a very dangerous combination.

5. Poor vision
6. Heart disease
7. Slowness
8. Infection
9. Economic risk-taking
10. Overproduction of urine