9) The power of association: Ensure that the same piece of soporific music is quietly playing each time you fall asleep. (sciencedaily.com)
However, milk contains relatively little tryptophan, so the soothing and soporific effects of warm milk may be purely psychological. (babycenter.com)
Having watched this unscary, cheerless thriller while slipping into increasingly soporific states of dismay and ennui, I couldn't tell you what the appeal is in 2014, other than pure nostalgia. (filmfreakcentral.net)