WTF! ICHILL IS THE OPPOSITE TO RED BULL! INSTEAD OF CHARGING YOU UP IT BRINGS YOU DOWN! BUT DRINKS WITH HORMONES IS JUST CRAZY!

They're the anti-Red Bulls. After nearly a decade of exploding energy drink sales, a new batch of relaxation tonics is creeping onto store shelves in the city - one drowsy shot at a time. The nonalcoholic drinks with slumbering names like iChill, RelaxZen and Dream Water are marketed to teens trying to wind down or adults who have trouble falling asleep. "I was knocked out cold," said NYU senior Mona Asinovski, 20, after drinking a 2.5-ounce Dream Water. "It's a very powerful thing. It's fascinating." Barclay MacKinnon, 23, a culinary student, is already a fan of Dream Water, which promises to send drinkers to dreamland in 30 minutes. "I wanted to go to bed and I felt the effects very quickly - maybe 15 minutes after drinking," MacKinnon said. "I felt relaxed, and my eyes started to get a little heavy. My muscles felt relaxed, and falling asleep was pretty easy." The relaxation drinks rack up about $20 million in sales a year, compared with $5 billion for energy drinks. Their popularity is growing in New York, but so are concerns about putting sleep-inducing melatonin in the drinks. Last month the FDA ordered the makers of Drank, a melatonin-based drink that launched in 2008, to prove that using the hormone in the drink is safe. Drank has 2 milligrams of melatonin - 20 times the body's natural amount. "Melatonin is a hormone," warned Dr. Charles Czeisler, a sleep expert with Harvard medical school. "[Hormones] should not be put in beverages, since the amount people drink often depends on thirst and taste rather than being taken only when needed like any other drug." Despite the FDA warning, the Daily News found Drank, Dream Water and RelaxZen - all melatonin-based drinks - on city store shelves last week. Duane Reade started selling Dream Water in December for $2.99 a shot. And 7-Eleven started selling iChill in September for the same price. The berry-tasting 2-ounce shot has 5 milligrams of melatonin - 50 times the body's natural amount. Experts say there haven't been reliable studies to determine the impact of melatonin on adults or children. Still, Dr. David Seres, a top nutrition expert with Columbia University Medical Center, urged kids and adults to steer clear of the hormone-infused drinks. The News found a Columbia University freshman who slept like a baby after downing a can of Drank. "I had the best night's sleep I had in quite a while," said Andrew, 18, who declined to give his last name. "It didn't taste too bad either." Not everyone is convinced. "What's wrong with chamomile tea?" asked Ryan Reid, a 34-year-old financial consultant from the upper West Side. "I don't think melatonin should be going into everyone's brain."