I also have a 20mth old son and before i do anything it make sure he is still sleeping or if hes up I take care of him first such as if he needs a bath first or make him breakfest then I put him in his room with his food and put a movie on so he can watch and then i put a gate up and then i hope in the shower i also make sure there is music on in his room and light from the window and that he cant