1. In which country do people sleep twice as much as they work?

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  • Netherlands
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  • Denmark
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  • Luxembourg
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Exactly

Denmark is a country where people sleep twice as much as they work, according to the 2023 World Sleep Trends Report by PlushCare - a healthcare service company in the US.

According to this report, Denmark is the only OECD country with a sleep/work time ratio of over 2 (specifically 2.01). Danes usually work about over 4 hours/day, while more than 76% of the population has a standard sleep of 7-9 hours/night.

Following Denmark is the Netherlands with a ratio of sleeping hours/working hours of 1.97, Germany 1.96, Luxembourg 1.93...

2. What is the happiest country in the world in 2025?

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The World Happiness Report 2025, released on March 20 - International Happiness Day - found Finland to be the happiest country in the world. This is the eighth consecutive year the Nordic country has held the top spot.

Denmark comes in second on the list. The country has flat terrain, fertile land, close water sources, and a sometimes harsh climate.

The World Happiness Report is published annually by the United Nations Sustainable Development Solutions Network. It is based on data from the Gallup World Poll, which surveyed people in more than 140 countries, asking them to rate their overall quality of life, combined with information such as GDP per capita, life expectancy, personal freedom, generosity, social support and corruption.

3. This country's flag is the longest continuously used in the world, true or false?

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  • Correct
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According to Guinness World Records, the Danish flag (Dannebrog) is the world's oldest continuously used national flag, having been first officially used in 1625.

The design of the flag consists of a Scandinavian cross (Nordic cross) on a red background. According to legends related to the country's history, the flag originated from the Battle of Lyndanisse in 1219. Later, Nordic countries such as Finland, Sweden, Norway, and Iceland also used this design on their national flags.

4. Which country has 1/3 of its population sleeping less than 5 hours per night?

  • America
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  • Qatar
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  • Korea
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  • Japan
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Exactly

According to PlushCare's 2023 World Sleep Trends Report, more than 36% of people in Qatar sleep less than 5 hours a night, the highest in the world. Following Qatar is Saudi Arabia, where the percentage of people sleeping less than 5 hours a night is over 32%. Meanwhile, Iran ranks third with about 29%.

5. Where does Vietnam rank in Asia in terms of the percentage of people who sleep little?

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In Asia, Vietnam is the second country with the least sleep in the region, after South Korea. Specifically, the rate of people sleeping less than 5 hours/night in Vietnam accounts for more than 22% of the population, while this rate in South Korea is 27%. In the world, Vietnam ranks 8th in the rate of people sleeping less.