Gelatin is rich in glycine, an amino acid that some small studies link to improved sleep quality, separate from the appetite-control angle this trend is usually marketed on.
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See What's Behind ThisWhat the Glycine Research Looks At
Small studies on glycine supplementation before bed have looked at sleep quality and how rested people feel the next day. Gelatin naturally contains glycine, which is part of why some people report trying the evening version specifically for sleep, not just appetite.
Quick Take
Plausible secondary benefit worth knowing about, separate from the trend's main appetite-control claim.
Where This Fits Best
If sleep is your main goal rather than appetite, the timing that makes the most sense is the before-bed version, drunk close to bedtime rather than ahead of a meal. Caffeinated variations like the green tea version work against that goal and are worth skipping in the evening.
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