TO USE: Take 300 to 600 mg of a hops supplement about 45 minutes before bedtime. Or look for blends that also contain valerian and/or passionflower. Follow label directions. CAUTION: Since hops could, theoretically, increase estrogen levels, women who’ve had breast cancer should avoid using the herb. TIERAONA LOW DOG, MD, is the author of Healthy at Home. Send your questions for Dr. Low Dog to askdrlowdog@prevention.com. More from Prevention: 20 Ways To Sleep Better Every Night