I dreamed about my sister when I was a child. At that time, my sister was still about 4 years old. We are very close. After waking up, I miss my sister and ask for help.

Maybe you have some anxiety or worry in your life recently. In the dream, you go back to your childhood, and most people have fond memories of childhood. You dream that going back to childhood is the satisfaction of your desire to live a carefree life, but dreaming of your sister may be that you haven't seen each other for a long time or that your recent troubles or anxieties are similar to some important childhood events or experiences that you and your sister experienced. You should treat the problems in real life correctly, have the courage to solve your own troubles, and if you miss your sister very much, you will always be with your sister. Personal opinion, for reference only.