My 15y/o sister confided in me that she has had violent dreams regularly where people she loves end up dead. She's had them regularly for as long as she can remember, and seems adjusted to it but still pretty terrified.

She was put on suicide watch at school when one of her friends couldn't take it anymore, but my sister assured me that she isn't thinking about it right now.

Usually I don't remember my dreams, and have a generally nonrestful sleep. I'm chronically depressed, but have never had any dreams like this before and was curious if anyone else has experienced this. I take my big brother role seriously and am looking to help her as best I can but am not truly sure how. Has anyone experienced this before?