The "sleepy girl mocktail" trend, which promises a dramatic gain of 84 minutes of sleep, is based on a very limited study of only 8 people; while tart cherry juice does promote relaxation by biologically protecting tryptophan, the overall effect remains modest and is largely overestimated by the viral trend.

noli's read

Matthew Walker's skepticism is scientifically justified because the viral claim of "84 more minutes of sleep" originates from a 2018 randomized pilot study (Jack Losso, American Journal of Therapeutics) that was completed by only 8 people, a sample size far too small to be generalized. Nevertheless, interest in tart cherry juice is based on real signals: a 2025 systematic review (PMC) confirms that it can moderately improve the duration and quality of sleep in adults. The biological mechanism mentioned by the creator is also validated in vitro in the Losso study, showing that the juice's antioxidants help preserve tryptophan from degradation linked to inflammation. As for the complete mocktail recipe, the synergy between cherry juice and magnesium has never been the subject of a comprehensive clinical trial. However, the efficacy of magnesium glycinate in promoting physical and nervous relaxation is well-demonstrated by several individual randomized controlled trials (RCTs). In short, Walker's analysis is very accurate: this evening ritual is an excellent wellness habit, but expecting a massive impact on sleep is an extrapolation of preliminary data.

the sources

1. 1Howatson G et al. 2012