1.  Efficient Use of Living Space

In Japan, most families use tatami mats—a highly versatile item. Tatami mats are not just ordinary floor coverings; they can also be converted into beds when needed or serve as seating areas when guests visit.

Because living space in Japan is often limited, using tatami mats helps save space and optimize living arrangements. Moreover, most Japanese homes are equipped with heating systems that keep the rooms warm, even during cold winters.

2.  Safety for Young Children

Another reason why Japanese people prefer sleeping on the floor is the belief that it is safer for children. Sleeping on a bed can pose a risk of children rolling off and getting injured. However, on the floor, children can freely roll and crawl without fear of falling or bumping into dangerous objects, giving parents peace of mind.

3.  Preparedness for Natural Disasters

Japan is a country prone to earthquakes, and its people must always be ready for emergencies. Sleeping on the floor allows individuals to better sense earthquake tremors and react quickly to seek safe shelter.

When sleeping on a bed, the shaking is often felt later, making it harder to respond promptly. Additionally, minimalist living spaces with fewer belongings enable easier and quicker evacuation during earthquakes.

4.  Health Benefits

Many Japanese believe that sleeping on an overly soft bed is not good for health, especially for bones and joints. They consider that a mattress with moderate firmness—not too hard or too soft—is the best choice. Sleeping on a flat, firm surface helps support the back and improves blood circulation by evenly distributing body weight, reducing pressure on various body parts.

Conversely, sleeping on a soft bed may feel comfortable initially but can cause the mattress to sag over time, leading to spinal curvature and back pain. Furthermore, sleeping on the floor helps elderly people avoid the risk of falls when moving from bed to the ground.

Japanese people don’t just lie on bare wooden floors—they use tatami mats or thin mattresses. Tatami mats are made by compressing dried straw, providing elasticity and comfort. Japanese mattresses are typically thin, and pillows are smaller and filled with materials like buckwheat hulls. Although these pillows feel somewhat firm at first, they offer excellent support for the neck and cervical spine.

5.  Easier to Wake Up

Another reason Japanese people prefer sleeping on the floor is that it helps them wake up more easily. Sleeping on a soft mattress can make it harder to get up early due to the warmth and coziness it provides. However, sleeping on the floor promotes better quality sleep and prevents dependency on blankets or pillows in the morning.

6.  A Part of Traditional Culture

The habit of sleeping on the floor has existed for thousands of years and is an integral part of Japanese culture. This tradition has been passed down through generations and remains a common practice in Japanese daily life.