I am MacBook Pro w/ Retina, Mid-2014, running macOS Sierra 10.12.1.
About 2/3 of the time my computer times out and goes to sleep, the screen goes blank as normal, but tries to wake it don't work. Can move mouse, but screen is black, can't click, can't press a key, etc. The only way to tempfix that I know is closing and reopening the screen. Then, everything returns to normal.
I noticed other topics similar to this, but I do not believe it works eventually as other topics say. Might be wrong though.