People should wash their sheets at least once a week. If you don’t sleep on your mattress every day, then you can probably wait longer between washes. For some people, once a week isn’t often enough; they may have to wash their sheets more frequently than that.

Fact

The University of Chicago conducted the first ever sleep study.

In 1925, Nathaniel Kleitman opened the world’s first sleep laboratory at the University of Chicago. Dubbed the Father of American Sleep Research, Dr. Kleitman eventually discovered rapid eye movement (REM) with his student, Dr. Eugene Aserinsky.

Now, sleep studies are known as polysomnography. These sleep studies record a patient’s vitals and brain waves throughout their slumber, and are used to diagnose sleep disorders.

Myth

Cold, wet weather can cause a cold.

The only way you can get sick is from infections caused by bacteria or viruses. However, mom and dad weren’t completely wrong when they told you to put on a hat before venturing outside with wet hair. Water carries heat away from the body much faster than air does, so you lose heat more quickly when you or the clothing you’re wearing is wet.