"developed acute insomnia immediately following a bad concussion. i would doze off but would wake up within 30 minutes, unable to fall back asleep for hours at a stretch. tried several sleeping medications (off-label use trazodone, ambien, melatonin, otc sleep aids. with no success for several weeks and was getting desperate.  a mere 3mg of doxepin saved my life. i slept for six straight hours the first night and it only got better and better.  i take 3mg around 9pm, sleep from 11pm to 6am very reliably and have few side effects besides a small amount of weight gain (about five pounds in my first two weeks) and slight drowsiness in the mornings and mid-afternoons.  i&#039;m so grateful to have my sleep back."