Why Recurring Dream Themes?

An observant Jewish friend told me she has recurring dreams about being caught unprepared for Shabbat. (Shabbat is the Jewish Sabbath, celebrated every Saturday, when observant Jews are forbidden to work, drive, carry things outdoors, spend money, use electrical devices, etc.) She said that in the dreams, she would be out driving, far from home, and realize that Shabbat was due to begin in a few minutes, with no way to make it home or get a hotel in time. I found this interesting because my recurring dreams are usually things like being caught unprepared for a homework assignment I have due tomorrow, or realizing I have to catch a plane flight but I'm not packed and don't have a plan to get to the airport. Most people attribute recurring nightmares to "fear". My friend is "afraid" of violating Shabbat; childhood me was "afraid" of having the assignment due the next day. This seems wrong to me. Childhood me was afraid of monsters in the closet; adult me is afraid of heart attacks, AI, and something happening to my family. But I don't have nightmares about any of these things, just homework assignments and plane flights. So maybe the "unprepared" aspect is more important. Here's a story that makes sense to me: what if recurring dreams are related to prospective memory? https://www.astralcodexten.com/p/why-recurring-dream-themes