What's the Name of That Book??? discussion

This topic is about
The Dreamstalker
SOLVED: Children's/YA
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SOLVED. YA Horror about teens getting killed in their sleep. Spoiler ahead. [s]
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Allie, please post a new comment if you're still looking for this book - or if you found it.
Allie (OP) last posted in the group in May 2019. Moving to Abandoned folder.
Allie (OP) last posted in the group in May 2019. Moving to Abandoned folder.
Great! Glad you found your book, Allie. Thanks for the update. Here's the link - The Dreamstalker by Barbara Steiner.
I first read this book in the mid 1990's -- it was probably published around then as well, maybe a little earlier. It was a paperback published in English.
I remember it being about a group of teenage friends who start dying suddenly...I vaguely recall the murders happening in their dreams or while they're asleep, and one of the deaths had something to do with orcas? If I recall correctly, the killer turned out to be the main girl's best friend, possibly even her twin brother, who was trying to keep her all to himself in some way? Maybe because she was going off to college and he wasn't?
It's possible I'm conflating multiple books here but I'm about 85% sure this is all the same book.
I know it is NOT any Christopher Pike or RL Stine book. I'm fairly certain it's also not Richie Tankersley Cusick but I wouldn't swear to that one.
Thanks for everyone's help!