The artificial smile left on your face when your real smile should have been terminated by something said by somebody else. Usually accompanied by a sudden and severe absence of the positive feeling that brought the smile on to begin with.
He told me my joke was ridiculous and that I should feel bad for saying it. Not to be shot down, I maintained my aftersmile until he left the room.
Either liquid niquil or any liquid drink with melatonin, Ashwaganda or other sleeping aids in a liquid form. If warm tea helps you get to sleep that could be sleepy juice too.
I could not sleep so I chugged some sleepy juice and now I'm so tired and sleepy.