Effective for over 88% of test listeners! This medical therapy music is a must-listen for anyone struggling with falling asleep or insomnia. Dela's "Ultimate Sleep" series has sold 400,000 copies!

The ultimate sleep music

If you average 8 hours of sleep per day, you spend one-third of your life sleeping.

Simply put, if you live to be 90 years old, you will have spent 30 years of your life sleeping. Why do people need so much sleep?

In addition to resting the mind and body, sleep also repairs cells and promotes metabolism necessary for life.

It is also deeply involved in brain functions such as organizing memories, and can be said to be necessary for keeping our brains and bodies healthy.

In today's society, where efficiency is emphasized, interest in sleep is on the rise, and the Ministry of Health, Labour and Welfare's "Sleep Guidelines for Health Promotion 2014" also mentions the importance of a good sleep environment, including the importance of devising relaxation methods that suit each individual.

Sleep is said to be the foundation of life.

Instead of just "sleeping" casually, why not enrich your life by creating a sleeping environment that suits you?

This album was produced after conducting numerous monitor surveys with the cooperation of Miho Mitsuhashi, a sleep therapist who has helped over 10,000 people with their sleep problems, and Masanori Nishida, a medical doctor who has also served as a visiting lecturer at Stanford University.

The mechanism of sleep

There are two types of sleep: REM sleep and non-REM sleep, and non-REM sleep has four different levels of depth.

REM sleep is a state in which the body's muscles are relaxed and brain waves are similar to those during waking hours. This state plays an important role in organizing memories, and gradually gets longer as the day progresses.

The state other than REM sleep is called "non-REM sleep." Both the mind and body are in a resting state, and the deepest non-REM sleep (deep sleep) occurs immediately after falling asleep.

This is what is known as deep sleep. Normally, a cycle of non-REM sleep followed by REM sleep repeats as shown in the diagram. This is called a sleep cycle, and each cycle lasts about 90 minutes, and is repeated about 4 to 5 times a night.

As the day progresses, the duration of REM sleep increases and the depth of sleep becomes shallower.

To get good quality sleep, the first 90 minutes of your sleep cycle are important, and it is said that ideally you should reach deep sleep level 3-4 shortly after falling asleep.



"Ultimate Sleep Music" Sound Composition

This time, we have used our know-how gained from creating sleep-inducing music over many years to determine the music, sounds, frequency bands, etc. that are optimal for falling asleep, and have created a listening sample.As mentioned in the previous section, the quality of sleep itself and even the mood upon waking up depend on whether you sleep deeply and soundly for the first 90 minutes of your sleep, so we focused on how best to induce sleep.

Based on data that shows that it takes an average person about 20 minutes to fall asleep, we created a piece of music with the following sound composition, aiming to predict changes in sleep state and their effects, divided into three stages.



Sleep-inducing music and 1/f fluctuations

The best music for falling asleep is music without lyrics. Lyrics stimulate the parts of the brain that are involved in understanding language, which can make you think too much. And they should be slow-tempo.

Listening to relaxing music synchronizes the rhythm of your breathing with the rhythm of the music, which naturally calms your breathing and helps you relax.

Another factor is "1/f fluctuation." "1/f fluctuation" refers to fluctuations that grow larger and smaller, become stronger and weaker, and are a harmonious blend of regularity and a moderate amount of surprise.

Sounds in nature, such as the sound of waves, the murmur of a stream, and the sound of the wind, contain an abundance of this type of vibration.

It is also said that human biological rhythms have this "fluctuation," and that by synchronizing with natural sounds, people can feel comfortable and relaxed.



The trick to using it is to keep the volume low and use breathing techniques .----------------Mitsuhashi Miho

There are many reasons why we can't get a good night's sleep, such as stress and a disrupted internal clock. Aging is one of them, and it's common for sleep to become shallower as we get older.

In fact, over the past few years, I have started to find it harder and harder to fall asleep.

I was fine during the day, so I didn't worry about it at first, but since I was having trouble falling asleep, I decided to try a few things. One of them was music, and I started to feel the effects from around the third day.

I wasn't used to listening to music while I was sleeping, so the music felt irritating on the first day, but once I got used to it, I found myself falling asleep before I knew it.

I've learned what the perfect volume is, and I've found that a quieter volume is more effective. It helps me focus on the music, calms my thoughts, and helps me fall asleep faster.

To help you fall asleep more effectively, try breathing slowly and deeply while listening to music.

We recommend the 4-4-8 breathing technique, which involves inhaling for 4 seconds, holding your breath for 4 seconds, and exhaling for 8 seconds.

Repeat this about 10 times, then breathe at a comfortable pace.



Miho Mitsuhashi (Sleep Therapist, Sleep Environment Planner)

After working as the head of research and development at a bedding manufacturer, he went independent in 2003. Over the past 20 years, he has solved the sleep problems of over 10,000 people, and he can even tell what kind of pillow is best for you just by touching your head.
Her practical advice that looks at sleep from various angles and easy-to-follow methods for getting a good night's sleep have garnered support on television and in magazines, and she is active in many fields as a sleep specialist.
His books include "100 Sleep Methods to Surprisingly Improve the Quality of Your Sleep" (Kank Publishing) and "A Book to Help You Sleep Deeply and Relaxedly by Listening to a CD" (PHP Institute), among many others. He works every day with the hope that the world will be filled with quality sleep.
Official website: http://sleepeace.com/

From the survey results after listening

This survey involved 23 general monitors who are interested in "sleep," who were asked to fill out a questionnaire before and after the trial to ask about their condition, changes, and impressions. Each monitor listener was asked to use the sound while sleeping in their everyday lives, following set precautions, a total of three times.



Examining the "Ultimate Sleep Music" ----------------Masanori Nishida

The survey results show that the ability to fall asleep changes with each passing day over the three-day trial.

At first, you may be startled by the sound of the waves, or unable to sleep due to the tension of listening to music while going to bed.

In sleep research experiments, participants may feel nervous when conducting an experiment in a different bedroom environment for the first time, and the experiment may not reflect their usual sleeping state.

This is called the first night effect, and it's a state where you're nervous about the music. In fact, it may make it harder for you to fall asleep on the first night.
The basis for falling asleep is "monotonous," and it is said that the more boring and monotonous something is, the better it is for sleep.

At first I was nervous, but I gradually got used to it and by the third day it was boring.In a sense, I could say that I was relieved of my tension and relaxed.

This is called habituation. The more you listen to something, the greater the effect will be, but I think this habituation effect is clearly reflected in the survey results.

Importantly, 88% of respondents reported that the treatment was effective from a subjective perspective. The definition of sleep disorders is based on how well people feel during the day, and subjectively feeling good can be inferred to mean feeling "good."
By listening to this music before going to bed for a few days, it is expected that the stimuli related to falling asleep will become less monotonous and the brain's hyperarousal will be alleviated.

Noise is a problem, but excessive silence can make people think about all sorts of things and make it difficult for them to sleep.

By getting used to this type of music that provides a moderate amount of calm, you may be able to naturally prepare yourself for sleep. It may be surprising at first, but we recommend trying it for three days.



Masanori Nishida (Sleep Medicine Certified Physician, Doctor of Medicine)

Born in Ishikawa Prefecture in 1970, he graduated from Tokyo Medical and Dental University. He has worked as an assistant professor at Tokyo Medical and Dental University, a lecturer at Jichi Medical University, and a visiting researcher at Harvard University and Stanford University, before becoming an associate professor at the Graduate School of Sport Sciences, Waseda University. He is a psychiatrist and a specialist at the Japanese Society of Sleep Research. His specialties are sleep, physical exercise, and mental health. His books include "The Vague Brain" (Asuka Shinsha), "A Book to Read When You Can't Shake Off Yesterday's Fatigue," "The Art of Resting" (Daiwa Shobo), and "The Art of Not Getting Panicked" (PHP Bunko), among many others.



<Track list>
1. Invitation to a Deep Sleep... (Part I)
2. Invitation to a Deep Sleep... (Part II)
3. Invitation to a Deep Sleep... (Part III)

<Product information>
Total 1 song: about 60 minutes
Price: ¥1,800 (excluding tax)
Product number: DLMF-3917
Music: Mitasuhiro

View product page >>> Ultimate Sleep Music