Whey Before Bed Halved Time to Fall Asleep. Casein Didn't
Everyone says casein is the bedtime protein, but a new randomized, double-blind crossover trial in humans found something odd. After resistance training, 40 g of whey taken 30 minutes before bed cut median sleep-onset time to 9 minutes versus 19 with a carb control, and also reduced next-day soreness. Casein did not significantly beat control. The catch: only nine people took part, and whey wasn't statistically better than casein head-to-head. Here's what the numbers show and what they can't prove.
Paraxanthine vs Caffeine: The Combo That Won, and the Sleep-Saver
Paraxanthine, caffeine's main metabolite, just went head-to-head with caffeine in a trial of 14 rowers. The combo of 200 mg each beat placebo on a 2000-m row, but only with a small effect (d = 0.30). Neither compound alone clearly improved performance. Paraxanthine alone, however, looked friendlier to subjective sleep. Here are the numbers, the limits, and who might actually benefit.
Casein Before Bed Won't Wreck Your Sleep, WHOOP Data Shows
Does a 40 g casein shake before bed secretly sabotage your sleep? A randomized, double-blind crossover trial in 21 NCAA Division I female athletes tracked sleep with WHOOP 4.0 bands and found no hit to sleep time, efficiency, resting heart rate or HRV. Alpha-lactalbumin and carbohydrate performed the same. But there's a twist: none of them improved sleep either. Here's what the data show, where the study falls short, and who should still skip the late-night shake.
The 'Sleep Protein' That Left Bad Sleepers Waking More Often
Alpha-lactalbumin is marketed as the "sleep protein," and earlier acute studies hinted it could help athletes sleep and perform. A new randomized crossover trial put it to the test in 24 athletes who actually sleep badly. After a week of 40 g taken 2 hours before bed, there was no sleep benefit, awakenings rose slightly (11.01 vs 10.25), and jump height dipped (27.68 vs 28.58 cm). The one upside was reduced negative mood in the evening. Here's what was tested, what the numbers show, and who should skip it.
Ashwagandha + Rhodiola Worked. The Evening Sleep Stack Didn't.
A new four-arm trial throws a curveball at the supplement-stacking crowd. In 103 healthy, active adults, a morning combo of 600 mg ashwagandha and 300 mg Rhodiola rosea was linked to lower perceived stress, better sleep quality and improved mood. The popular evening stack of magnesium L-threonate, L-theanine and apigenin added nothing, and taking both looked worse on positive affect. Here's what the study found, why it needs caution (only two weeks, small groups), and how lifters might use it.
The 15 g Bedtime Collagen Trick That Cut Night Wake-Ups by 27%
Waking up repeatedly through the night can quietly sabotage your recovery, even when training and nutrition are dialed in. A small trial found that 15 g of collagen peptides taken an hour before bed cut polysomnography-recorded awakenings from 29.3 to 21.3, roughly 27% fewer. Participants also scored better on a morning Stroop test. But total sleep time, sleep latency and sleep efficiency didn't budge, and the study involved just 13 men over 7 nights with an industry-supplied product. Here's what the data really shows and how lifters might test it safely.