R’s KOSO for Better Sleep: Resetting Your Body Clock Naturally

29 Jul, 2025

Have your sleep habits gotten out of sync this summer? You're not alone. Between late nights, irregular schedules, and lingering heat, many of us find ourselves tossing and turning. If you’ve been waking up tired, feeling groggy during the day, or relying on coffee or sugar to get through work or school, it might be time to reset, starting with your gut.

Let’s explore how your digestive health and circadian rhythm are deeply connected and how incorporating R’s KOSO, a traditional Japanese fermented drink, into your everyday routine may help restore restful sleep, naturally.

Why Good Sleep Starts in Your Gut

While you sleep, your body performs essential tasks: repairing tissues, producing energy, boosting immunity, and regulating hormones. Two key hormones—melatonin and cortisol—play major roles in determining your sleep quality.

Melatonin, known as the “sleep hormone,” signals your body to wind down. It begins to rise about 14-16 hours after you wake up, peaking between 2–3 a.m.
Cortisol, the “stress hormone,” helps you wake up, peaking 30–60 minutes before morning.

To produce enough melatonin at night, your body first needs a steady supply of serotonin, a neurotransmitter made in the gut. About 90 percent of serotonin is produced in your intestines. And this is where your gut microbiome comes in.

A healthy, balanced gut can improve your serotonin production, which directly supports melatonin release. In other words, a happy gut sets the stage for quality sleep.

How Summer Throws Off Your Sleep

Studies show that sleep quality significantly declines from May to August. One large-scale U.S. study (Stanford University x Brain Sleep, 2024) found that:

Sleep scores in July were the lowest of the year
People slept an average of 12 minutes less than in December
Wake-ups during the night increased, and deep sleep time declined

The main culprit? High temperatures and humidity prevent the natural drop in core body temperature needed for sleep.

Gut-Sleep Connection: The Role of KOSO

R’s KOSO is a fermented drink made from over 100 plant-based ingredients, rich in probiotics, postbiotics, and prebiotics that nourish your gut microbiome. By supporting digestive health, R's KOSO may help balance serotonin levels and, in turn, improve melatonin production.

Why take KOSO in the evening?

Many users report better sleep and easier digestion when they incorporate R's KOSO as part of a nighttime ritual. Because it’s probiotic-rich and easy to digest, it won’t weigh you down before bed. Plus, its mild sweetness can help reduce nighttime sugar cravings often linked to low serotonin.

Q: I want to take R’s KOSO before bed, but I’m concerned about blood sugar levels. What’s the best way to take it at night? Should I replace dinner with it?

A: If you’re mindful of blood sugar levels, here’s some good news—drinking R’s KOSO slowly after dinner is unlikely to cause a blood sugar spike. Here’s why:

1. Having KOSO after a balanced meal (with protein, fat, or fiber) helps slow down the absorption of sugars, keeping your blood sugar stable.

2. Sipping KOSO slowly also reduces the chance of a spike, as your body processes the sugars more gradually.

Replacing dinner with R’s KOSO isn’t recommended if you’re worried about blood sugar. Doing so might lead to low blood sugar overnight, which can disrupt sleep. It may also cause a stronger blood sugar surge the next morning at breakfast.

Instead, try this:

Have a smaller, balanced dinner (with some protein, fat, and fiber), then enjoy a tablespoon of R’s KOSO in water or warm tea slowly afterward. It’s a gentle way to support digestion and your gut overnight without causing glucose concerns.

Signs Your Sleep May Be Suffering

If any of the following sound familiar, your sleep (and possibly your gut health) may need attention:

Waking up feeling unrefreshed
Daytime fatigue or brain fog
Poor focus or mood swings
Cravings for sugar or carbs
Skin dullness or hormonal imbalance

These can be common signs of disrupted melatonin–cortisol cycles, and potentially a stressed gut.

Tips for Better Summer Sleep (That Start During the Day)

Here’s how to naturally improve your sleep with gut health in mind.

1. Get Sunlight Early in the Day

Morning light exposure helps regulate melatonin production at night.

2. Eat Gut-Friendly Meals

Incorporate fiber-rich foods and fermented items like miso, yogurt, or R’s KOSO to fuel beneficial bacteria.

3. Avoid Caffeine After 2 p.m.

Caffeine lingers in your system for up to 12 hours and may interfere with sleep quality.

4. Create a Cool Sleep Environment

Set your AC around 78°F (26°C), and use a fan near your feet to encourage airflow. Keep it running for at least the first 3 hours of sleep (ideally overnight in a hot night).

5. Switch to Warm Lighting

White or blue-toned lights suppress melatonin. Opt for amber or dim lights in the evening.

6. Try a Worry Journal

If stress is keeping you awake, write down your thoughts before bed. Research shows this practice can shorten sleep onset by up to 9 minutes.

A Gentle Reset with R’s KOSO

After a summer of late nights, R’s KOSO offers a gentle way to support your body’s natural rhythms. By improving your gut environment, you may find it easier to fall asleep, stay asleep, and wake up energized.

Start small:

Add KOSO to a calming tea in the evening
Mix it with warm (not hot) water as a pre-bed drink
Replace your sugary nighttime snack with a KOSO smoothie

R’s KOSO is vegan, gluten-free, and made with care in Japan. It is perfect for those seeking natural wellness from the inside out.

Final Thoughts

Sleep isn’t just a nightly routine. It is a pillar of your long-term health. This summer, give your body the reset it needs. Start with your gut, and let your sleep follow.

Let’s get started!

Written by Eriko Shintani

Certified holistic nutritionist/Holistic nutrition advisor

Instagram: https://www.instagram.com/vegefuldays/

Reference:

Benedict, C., Scheller, J., Rose-John, S., Born, J., & Marshall, L. (2009). Enhancing influence of intranasal interleukin-6 on slow-wave activity and memory consolidation during sleep. The FASEB Journal, 23(10), 3629–3636. https://doi.org/10.1096/fj.09-133058
Czeisler, C. A., & Gooley, J. J. (2007). Sleep and circadian rhythms in humans. Cold Spring Harbor Symposia on Quantitative Biology, 72, 579–597. https://doi.org/10.1101/sqb.2007.72.064
Gao, K., Pi, Y., Mu, C., & Ma, Q. (2019). The role of gut microbiota in the regulation of melatonin secretion. Frontiers in Physiology, 10, 1387. https://doi.org/10.3389/fphys.2019.01387
Ly, J. Q. M., Lane, J. M., Jordan, R., & Duffy, J. F. (2021). Impact of seasonal and environmental factors on sleep. Current Sleep Medicine Reports, 7(2), 55–63. https://doi.org/10.1007/s40675-021-00201-z
Mayer, E. A., Tillisch, K., & Gupta, A. (2015). Gut/brain axis and the microbiota. The Journal of Clinical Investigation, 125(3), 926–938. https://doi.org/10.1172/JCI76304
Walker, M. P. (2017). Why we sleep: Unlocking the power of sleep and dreams. Scribner.
Wu, G. D., Chen, J., Hoffmann, C., Bittinger, K., Chen, Y. Y., Keilbaugh, S. A., ... & Lewis, J. D. (2011). Linking long-term dietary patterns with gut microbial enterotypes. Science, 334(6052), 105–108. https://doi.org/10.1126/science.1208344

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R’s KOSO for Better Sleep: Resetting Your Body Clock Naturally

Let’s explore how your digestive health and circadian rhythm are deeply connected and how incorporating R’s KOSO, a traditional Japanese fermented drink, into your everyday routine may help restore restful sleep, naturally.

Why Good Sleep Starts in Your Gut

While you sleep, your body performs essential tasks: repairing tissues, producing energy, boosting immunity, and regulating hormones. Two key hormones—melatonin and cortisol—play major roles in determining your sleep quality.

Melatonin, known as the “sleep hormone,” signals your body to wind down. It begins to rise about 14-16 hours after you wake up, peaking between 2–3 a.m.

Cortisol, the “stress hormone,” helps you wake up, peaking 30–60 minutes before morning.

To produce enough melatonin at night, your body first needs a steady supply of serotonin, a neurotransmitter made in the gut. About 90 percent of serotonin is produced in your intestines. And this is where your gut microbiome comes in.

A healthy, balanced gut can improve your serotonin production, which directly supports melatonin release. In other words, a happy gut sets the stage for quality sleep.

How Summer Throws Off Your Sleep

Studies show that sleep quality significantly declines from May to August. One large-scale U.S. study (Stanford University x Brain Sleep, 2024) found that:

Sleep scores in July were the lowest of the year

People slept an average of 12 minutes less than in December

Wake-ups during the night increased, and deep sleep time declined

The main culprit? High temperatures and humidity prevent the natural drop in core body temperature needed for sleep.

Gut-Sleep Connection: The Role of KOSO

R’s KOSO is a fermented drink made from over 100 plant-based ingredients, rich in probiotics, postbiotics, and prebiotics that nourish your gut microbiome. By supporting digestive health, R's KOSO may help balance serotonin levels and, in turn, improve melatonin production.

Why take KOSO in the evening?

Many users report better sleep and easier digestion when they incorporate R's KOSO as part of a nighttime ritual. Because it’s probiotic-rich and easy to digest, it won’t weigh you down before bed. Plus, its mild sweetness can help reduce nighttime sugar cravings often linked to low serotonin.

Q: I want to take R’s KOSO before bed, but I’m concerned about blood sugar levels. What’s the best way to take it at night? Should I replace dinner with it?

A: If you’re mindful of blood sugar levels, here’s some good news—drinking R’s KOSO slowly after dinner is unlikely to cause a blood sugar spike. Here’s why:

1. Having KOSO after a balanced meal (with protein, fat, or fiber) helps slow down the absorption of sugars, keeping your blood sugar stable.

2. Sipping KOSO slowly also reduces the chance of a spike, as your body processes the sugars more gradually.

Replacing dinner with R’s KOSO isn’t recommended if you’re worried about blood sugar. Doing so might lead to low blood sugar overnight, which can disrupt sleep. It may also cause a stronger blood sugar surge the next morning at breakfast.

Instead, try this:Have a smaller, balanced dinner (with some protein, fat, and fiber), then enjoy a tablespoon of R’s KOSO in water or warm tea slowly afterward. It’s a gentle way to support digestion and your gut overnight without causing glucose concerns.

Signs Your Sleep May Be Suffering

If any of the following sound familiar, your sleep (and possibly your gut health) may need attention:

Waking up feeling unrefreshed

Daytime fatigue or brain fog

Poor focus or mood swings

Cravings for sugar or carbs

Skin dullness or hormonal imbalance

These can be common signs of disrupted melatonin–cortisol cycles, and potentially a stressed gut.

Tips for Better Summer Sleep (That Start During the Day)

Here’s how to naturally improve your sleep with gut health in mind.

1. Get Sunlight Early in the Day

Morning light exposure helps regulate melatonin production at night.

2. Eat Gut-Friendly Meals

Incorporate fiber-rich foods and fermented items like miso, yogurt, or R’s KOSO to fuel beneficial bacteria.

3. Avoid Caffeine After 2 p.m.

Caffeine lingers in your system for up to 12 hours and may interfere with sleep quality.

4. Create a Cool Sleep Environment

Set your AC around 78°F (26°C), and use a fan near your feet to encourage airflow. Keep it running for at least the first 3 hours of sleep (ideally overnight in a hot night).

5. Switch to Warm Lighting

White or blue-toned lights suppress melatonin. Opt for amber or dim lights in the evening.

6. Try a Worry Journal

If stress is keeping you awake, write down your thoughts before bed. Research shows this practice can shorten sleep onset by up to 9 minutes.

A Gentle Reset with R’s KOSO

After a summer of late nights, R’s KOSO offers a gentle way to support your body’s natural rhythms. By improving your gut environment, you may find it easier to fall asleep, stay asleep, and wake up energized.

Start small:

Add KOSO to a calming tea in the evening

Mix it with warm (not hot) water as a pre-bed drink

Replace your sugary nighttime snack with a KOSO smoothieR’s KOSO is vegan, gluten-free, and made with care in Japan. It is perfect for those seeking natural wellness from the inside out.

Final Thoughts

Sleep isn’t just a nightly routine. It is a pillar of your long-term health. This summer, give your body the reset it needs. Start with your gut, and let your sleep follow.

Let’s get started!

Written by Eriko Shintani

Certified holistic nutritionist/Holistic nutrition advisor

Instagram: https://www.instagram.com/vegefuldays/Reference:

Benedict, C., Scheller, J., Rose-John, S., Born, J., & Marshall, L. (2009). Enhancing influence of intranasal interleukin-6 on slow-wave activity and memory consolidation during sleep. The FASEB Journal, 23(10), 3629–3636. https://doi.org/10.1096/fj.09-133058

Czeisler, C. A., & Gooley, J. J. (2007). Sleep and circadian rhythms in humans. Cold Spring Harbor Symposia on Quantitative Biology, 72, 579–597. https://doi.org/10.1101/sqb.2007.72.064

Gao, K., Pi, Y., Mu, C., & Ma, Q. (2019). The role of gut microbiota in the regulation of melatonin secretion. Frontiers in Physiology, 10, 1387. https://doi.org/10.3389/fphys.2019.01387

Ly, J. Q. M., Lane, J. M., Jordan, R., & Duffy, J. F. (2021). Impact of seasonal and environmental factors on sleep. Current Sleep Medicine Reports, 7(2), 55–63. https://doi.org/10.1007/s40675-021-00201-z

Mayer, E. A., Tillisch, K., & Gupta, A. (2015). Gut/brain axis and the microbiota. The Journal of Clinical Investigation, 125(3), 926–938. https://doi.org/10.1172/JCI76304

Walker, M. P. (2017). Why we sleep: Unlocking the power of sleep and dreams. Scribner.

Wu, G. D., Chen, J., Hoffmann, C., Bittinger, K., Chen, Y. Y., Keilbaugh, S. A., ... & Lewis, J. D. (2011). Linking long-term dietary patterns with gut microbial enterotypes. Science, 334(6052), 105–108. https://doi.org/10.1126/science.1208344

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Instead, try this:

Have a smaller, balanced dinner (with some protein, fat, and fiber), then enjoy a tablespoon of R’s KOSO in water or warm tea slowly afterward. It’s a gentle way to support digestion and your gut overnight without causing glucose concerns.

Replace your sugary nighttime snack with a KOSO smoothie

R’s KOSO is vegan, gluten-free, and made with care in Japan. It is perfect for those seeking natural wellness from the inside out.

Instagram: https://www.instagram.com/vegefuldays/

Reference: