Dormitive
It’s an adjective and it means having the effect of inducing sleep and can be applied to a number of different things, certain lessons, lectures, speakers, conversations, subjects, books, you get the idea. Anything that can cause you to fall asleep is dormitive, some things are so dormitive that you start losing the will to live, yes I know, we’ve all been there.
Malcolm started telling me about his weekend, so dormitive Jenny had to wake me.
dormite
neutral; not moving; could also mean tired or weak
Robert is one dormite sum bitch...