What is the Japanese trick to sleep?

Several unrelated ideas are promoted online as the Japanese trick to sleep, so the term does not refer to one medically established method. One version is moon breathing, in which a person closes the right nostril and breathes slowly through the left. Another viral method involves lying down and gently shaking raised arms and legs, sometimes called the cockroach exercise. Japanese-inspired Kaizen advice instead focuses on making small, consistent improvements to the bedtime routine. Evidence for these specific tricks is limited, especially for children. Safer, better-supported approaches include regular sleep times, a calm routine, reduced evening screen use and a comfortable bedroom. Avoid breath-holding, mouth taping or unusual sleep techniques for children unless a qualified healthcare professional recommends them.