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They reach for a different supplement
Sometimes, you wake up in the middle of the night and you can't go back to sleep because your brain just won't shut off. Rebeccah Shalev, ND, with the Holtorf Medical Group, calls this her "internal hamster wheel" and to quiet it down, she'll take three grams of glycine, a safe, nonessential amino acid that you can buy in supplement form over-the-counter. Research has shown that people who take it have better quality sleep compared to those taking sleep drugs, wake up feeling peppier and experience less fatigue. Glycine is abundant in foods like gelatin, lunch meat and crab—though those likely sound unappetizing at 2 a.m. The supplement can be taken at any time, which is great for middle-of-the-night awakenings. (Other popular supplements like melatonin shift your sleep schedule, which is particularly beneficial for jet lag; but ideally need to be taken a couple hours before bed.)