Step 1: Understanding the Question:
The question asks to identify Socrates' activity at a specific time, midnight.
Step 2: Locating the Information in the Passage:
The first two lines state, "Saint Socrates was preaching his disciples."
The passage then mentions, "At midnight she got angry."
This implies that the preaching was ongoing at midnight when his wife became angry.
Step 3: Final Answer:
Combining these pieces of information, we can conclude that at midnight, Socrates was still engaged in preaching to his disciples.