my son is 13months old, sometimes will wake up during midnight, I will say "Good night" to him, and turn off all the light, let him know that it's time to sleep and no one will play with him.
sometimes he may cry for a while (he cried for a hour few times too), but we keep watching him in the dark but pretend we are sleeping. then he will fall asleep again by himself.
however, not every mom can do that, because you must be very 狠心 D ga