For some reason it's become my responsibility to refill the coffee pot, and at first I kept forgetting to do it at night. So my aunt recommended that I do it right after I drink my coffee, so that it'll be fresh in my mind.
And at first, it went okay. I kept the habit up for a few weeks, but then I missed one single day and the habit completely vanished. No compulsion to continue it. And extremely difficult to do it unless someone reminds me.