Answer:It's supernatural, but I don't know what to call it. Linda's consciousness is moving in time to previous days, somewhat randomly, after she sleeps. When she wakes on a day in the past, she has knowledge of the future, and her actions apparently 'stick' and change what happens in the days after. She has to figure out the rules of time travel, how her husband came to die in the crash, and how to prevent it. It was a lot for the audience to follow.
Answer: It's supernatural, but I don't know what to call it. Linda's consciousness is moving in time to previous days, somewhat randomly, after she sleeps. When she wakes on a day in the past, she has knowledge of the future, and her actions apparently 'stick' and change what happens in the days after. She has to figure out the rules of time travel, how her husband came to die in the crash, and how to prevent it. It was a lot for the audience to follow.