Hi,
The sometimes explicit and often accepted and almost imperceptible inferiority extant in muslim communitities and families bears hevily on any muslem woman who intends to be independent causes psychological stress.
Your dreams are caused by pangs of consciousness about choosing your own way.
The problem is exceptionally acute when boyfriends and possible marriage is concerned.
Regarding your dreams, they are normal. Perhaps you sleep nearer to the waking level of conscoiusness? We all have a longer period of sleep at the start and progresssively shorter ones as the night goes on.
Your subconscious uses your concern for your sister as waking element.