
Coca-Cola claims its new drink will reduce stress and anxiety while promoting drowsiness and restful sleep, but does it deliver on its promise?
After hearing about Coca-Cola’s intriguing new Sleep Water, designed to bring about a night of restful slumber, we couldn’t help but wonder if a mere bottle of H2O could really help us catch some zzz’s. Skeptical yet curious, we stopped by the local convenience store and picked up a bottle for ourselves to see just how well the drink performs in an unregulated environment.
▼ The 410-milliltre (14-ounce) bottle is priced at 151 yen (US$1.40), and we found ours strategically located between the Coke and the regular water in-store.
Winding down
Ignoring the advice from the “sleep agents” who appeared in the brand’s humorous commercial, we decided to really put the drink through its paces by forgoing the luxuries of aromatherapy and relaxation music, instead opting for a typical night of laptop use and smartphone-scrolling before bed.
The serving is quite a lot to get through in the evening when you’re not particularly thirsty, so we can understand why the company recommends trying this after a long, hot bath, when your body would be naturally crying out for some liquid replenishment.
We decide to start drinking after dinner at about 8:00 p.m. Although we haven’t stepped out from a bath, we’re mildly relaxed but, as ever, still thinking about work and the tasks in store the following day. In front of the television and the laptop, and with our mobile phone nearby, it’s a typical evening with the only difference being the addition of the unusual Sleep Water.
Down the hatch
The taste is sweet and pleasantly peach-like, and despite being billed as a sleep medicine of sorts, it doesn’t taste like medicine at all. Looking at the back of the bottle, the first ingredient listed is sugar, followed by chamomile extract and theanine, the amino acid responsible for decreasing anxiety and promoting restful sleep. While the clear liquid is light and delicious, the sugar content and sweet peach flavour means teeth-brushing afterwards is highly recommended.
Preoccupied with the Internet and a television variety programme filled with riotous laughter and enthusiastic food tasting, we forget about the Sleep Water until, about 45 minutes later, a strange feeling of relaxation begins creeping in. The noticeable calmness comes with a clear, stress-free mind and a subtle lightness in the limbs that’s similar to the effects of a glass of wine but without the fogginess. With 200 milligrams of theanine in our system, there’s a slight sedative effect that stops the mind from racing and encourages the body to wind down in a welcome, natural manner. Feeling drowsy and relaxed, we get into bed at 10:00 p.m. and drift off much more easily than usual.
Rise and shine?
After eight hours of sleep, we wake to a new morning. Sadly, there was no desire to jump out of bed feeling elated and refreshed, but that could have been due to the unusually hot weather during the night. As the day wears on, we’re not as tired as usual, but we’re still disinclined to credit that to the effects of the water as there are too many other factors in play during the day. The one thing that really did stand out during the whole experience was the strange, yet pleasant, feeling of relaxation that came about after drinking the sleep water during the evening. With L-Theanine often used as a supplement in 200-milligram tablets to treat anxiety, we can certainly vouch for the calming effect of the amino acid in water form.
Currently available at stores around the country, Sleep Water is definitely a drink to try while you’re in Japan. Whether you’re an exhausted member of Japan’s unrelenting workforce or a visitor dealing with jet lag, it’s an easy and effective way to relieve stress and doze off gently into the world of slumber.
Photos © RocketNews24







New “Sleep Water” from Coca Cola Japan promises to help you drift off, wake up refreshed
Coca-Cola to release their healthiest cola ever in Japan this March
Coca-Cola Japan are testing “fill your own bottles” water dispensers to help reduce plastic waste
Coca-Cola Japan releases new clear coke this month, we get to try it before it goes on sale
We Made Coca-Cola Transparent and Colorless. It Tastes Like…
Beautiful exclusive Totoro tenugui towel is a gift from Disney to Ghibli physical media buyers
Brand new Shinkansen bullet train unveiled in Japan… but it won’t carry passengers
Cup Noodle releases cold-water instant ramen in Japan, but can it really be made with just cold water?
Sanrio eco-friendly plushies are here for the earth-conscious lovers of all things kawaii
Studio Ghibli releases anime T-shirts that pay homage to one of Hayao Miyazaki’s most personal films
Japanese convenience store releases Japanese convenience store-flavor fried chicken
Hatsune Miku collaborates with Hokusai’s art in new Vocaloid ukiyo-e illustration series [Pics]
Giant Snorlax, other snoozing Pokémon appear in Yokohama for Pokémon Sleeping Faces Research [Pics]
Taco sandwiches appear in Japan with new Lunch Pack sandwich pocket flavor[Taste test]
Yakuza members arrested for building a road on mountain they don’t own
Japan now has human refrigerators inspired by Japanese vending machines
Family Mart’s new Tokyo flagship convenience store doesn’t feel convenient, but is that a problem?
Starbucks Japan releases new Discovery Series collection celebrating local regions and traditions
Teen girl in Japan refuses to be victim, personally escorts train pervert to police for arrest
Cup Noodle unveils first-ever cold-water instant ramen in Japan
Is Japan’s tourism boom slowing down? Foreign visitor numbers fall for first time in five years
Evangelion beautifully reimagined as iconic classical Japanese folding screen art series [Photos]
Japan announces sudden 400-percent increase in visa fees for foreigners entering the country
Studio Ghibli has a new anime out, and there’s only one place in the world where you can see it
Salomon releases Japan-exclusive Mt. Fuji hiking gear that doubles as an amazing souvenir
Japan triples departure tax, foreign tourists and locals now must pay more to leave country
Japan launches first overnight Shinkansen bullet train between Tokyo and Osaka this summer
Family Mart opens new “Famima” flagship store in Tokyo that’s like a tourist attraction
Sanrio Character Poll announces winners, Hello Kitty absent from top 10 in many countries
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Starbucks Japan releases new drinkware and goods for Valentine’s Day
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s newest Shinkansen has no seats…or passengers [Video]
Japanese ninja certification exam attracts 131 candidates from Japan and abroad
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
Japan reportedly adding Japanese language skill requirement to most common foreigner work visa
Coca-Cola raises prices in Japan for the first time in 27 years
Coca-Cola’s Lemondo canned cocktail gets a limited edition upgrade–and we got to try it first!
Coca-Cola Japan brings out a new design bottle exclusive to Okinawa
We try unagi cola with genuine eel extract 【Taste Test】
Coca-Cola’s green tea cubes are an awesome new way to make Japan’s favorite drink【Photos】
Is Coca-Cola Japan’s brand-new strawberry Coke any good?【Taste test】
Japan’s new watermelon Fanta is first of its kind with added salt content
Bleach Coca-Cola is on sale in Japan and won’t kill you, but how does it taste?【Taste test】
Coca-Cola Company releases new line of alcoholic drinks in Japan, and we’ve tried it
In Japan, you can now get Coca-Cola pre-mixed with coffee【Taste test】
What happens if you make instant noodles with Coca-Cola instead of water?
Coca-Cola Japan changes recipe for best-seller matcha latte, but is it worth a sip?【Taste test】
Is Coca-Cola Japan’s new canned Jack Daniels cocktail better than mixing your own?【Taste test】
Self-freezing bottled Coca-Cola now available at convenience store vending machines in Japan
Coca-Cola now sells hard lemonade in Japan — Three flavors to keep you relaxed all summer long