Hello there,
I understand your grief, I also lost my sister 2 years back and the pain is still kinda raw...But yeah, as everyone says, you start living with it...
Dreams...I dont know, I dream of my sis every night...Sometimes, she is really happy, at other times, I see myself doing things together..its all really nice..but when I wake up, I yearn for her..just to talk to her once...ask her if she is fine...
so, may be, dreams are a way to communicate.. or may be not.. but they make me closer to my sister...