To dream of being in may reflect how you are doing things you never got to do. A reflection of your speaking to people about the past or researching . Noticing or talking to people about what life was like when you weren’t around. Looking at old photos, discussing family history, or nostalgia.
Alternatively, dreaming of may reflect feelings of being forced to live with problems that you feel shouldn’t be a problem.
Dream of with specific eras may reflect your preoccupation with a certain mindset or lifestyle. For example, living in the Victorian era may reflect your preoccupation or obsession with being perfect, clean, and respecting yourself.