Armies started using the 24-hour method of timekeeping as standard military time because, much like police, fire, and medical departments, every branch of the armed services is in continuous operation ...

Non-24-hour sleep-wake disorder (N24SWD) occurs when your sleep-wake cycle gradually shifts out of sync with the 24-hour day. It affects about half of blind people, but it can also affect those with ...

Sleep-deprived and having done nothing but playwriting and rehearsal for the last 24 hours, participants of the 24 Hour Play Festival performed in front of a nearly full Lyceum Theatre in Tempe on Oct ...

Fine. Let’s do a little math. There are 168 hours in a week. Say you work 40 hours a week. Actually, let’s say you work 50 hours a week. (Even though you may be at work for 50 hours, you aren’t ...

A key player in the U.S. stock market has decided to ask the SEC for permission to extend its hours of operation as close as possible to 24 hours a day, five days a week An earlier version of this ...