Have you heard the saying, sleeping with one eye open? It refers to light sleepers who can pretty much tell you everything that happened while they were supposed to be asleep. They very seldom miss out on anything that happens day or night.

Dolphins sleep with one eye open. Most humans would find it impossible to sleep with one eye open. Dolphins, on the other hand, can’t sleep any other way. That’s because, unlike us, they don’t breathe automatically and have to remain conscious in order to do so.

The solution to this predicament is called unihemispheric slow-wave sleep, which means one half of the brain rests while the other remains awake. When the right half of a dolphin’s brain is sleeping, its left eye is closed, and vice versa.  

Dolphins periodically alternate which side of the brain is asleep in order to rest fully while retaining consciousness. While sleeping, dolphins may rest motionless or swim slowly and steadily near the water’s surface. Strange mammals.

A number of their fellow sea creatures, from beluga whales to sea lions, also exhibit unihemispheric sleep. On the other end of the spectrum are otters, who float belly-up and often hold hands with one another so as to not drift apart while snoozing.

Great Frigatebirds, meanwhile, sleep in 10-second bursts while remaining airborne for as long as two months at a time. And, like dolphins, they do it with one eye open.

The Bible often talks about watchmen, which are people who stand guard and protect others. These watchmen have an important job, keeping watch for danger and guiding their communities in faith.

Just like a guard on a tower, they help keep everyone safe and alert. Through scripture, we learn about the role of watchmen and how they are called to be responsible for the well-being of others.  

The watchman’s duty is to communicate God’s message, offering a chance for people to repent and be saved from destruction. If the watchman fails to warn, they become responsible for people’s deaths.

But if they warn and the people refuse, the people are responsible for their own fate.