Answer:
The old man was sleeping with both of his eyes closed
Step-by-step explanation:
According to the narrator, he fails to kill the old man the first seven nights as he is angry with the old man because of his eye, therefore, when he comes the first seven nights, the man's eyes are closed.
As a result of this, he fails to kill the old man because he does not have any reason to end his life as his eyes are closed.