You will be given a definition of a task first, then some input of the task.
In this task, you're given a context passage. Your job is to generate relevant questions that can be answered by directly referring to the passage.

He awoke to silence . Rolling over with his face towards the muted light that streamed from a small part in the curtains over his bed . Abel squinted his winter blue eyes to focus on the washed out world beyond .
Output:
What may have caused him to wake up ?