My goal this year is to have a post to Monochromatic Outlook every day, which might sound good but you also might end up with a bunch of vocab items. I have a backlog of words that I've had to look up but which have not yet made it to the database. I'll try not to rely too heavily on these as daily filler, but I'm making no guarantees.
About soporific, I'm embarrassed to say I wrote down the word but I did not write down the source. So I have no backstory except that I read it and looked it up. I have a vague recollection that I encountered it in another context very soon after I looked it up, but it's all hazy.