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Hit the hay?

The report did not say how many cities were included in the study.

The study also found that the phrase “early to bed, early to rise” apply to people in Brisbane who go to bed earliest at 10.57pm and wake up earliest at 6.29am.

People in Moscow, on the other hand, hit the sack latest at 12.46am and are also the latest to rise at 8.08am.

- Singapore among cities in the world with least hours of sleep: Study, StraitsTimes.com, August 20, 2017.

3. Your brain’s pineal gland, which is inactive during the daytime, begins to produce melatonin around 9 p.m., making you less alert and ready to hit the hay. The levels of melatonin stay elevated in your blood for about 12 hours until morning. Because melatonin levels are mostly affected by light, it’s nicknamed the “Dracula of Hormones.”

Since 1994, melatonin has been sold over-the-counter in American markets and labeled as a dietary supplement, since it isn't a drug and can be found naturally in food and our bodies, according to the National Sleep Foundation. You can find it in many health food aisles as a small pill that ranges in dosage from 1 milligram to 3 milligrams. According to the University of Maryland Medical Center, there is no recommended dosage for melatonin supplements.

“As a sleep physician, I use it in certain situations and I do recommend it to patients, but ... it is not something I can write a prescription for,” M. Safwan Badr, the immediate past president of the American Academy of Sleep Medicine, tells Mashable. “If someone’s using [Sprayable Sleep] and it’s [having a positive effect on] them, I’m not going to tell them not to.”