"i was prescribed this after diagnosis of ptsd &amp; anxiety waking me up during the night and always having difficulty falling back asleep. i take a 1/4 to 1/2 of 25mg tab (i&#039;m 5ft6 130lbs) and i feel the effects of tingling legs and drowsiness after about 30 min. sleep 8-9h/night and can wake up with noises  (husbands alarm, dog moving around) as i&#039;m a light sleeper but always fall back asleep. i&#039;ve tried melatonin, gravol, benadryl and this is the best. no side effects so far...!"