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

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Maniac
SOLVED: Children's/YA
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SOLVED. YA Fantasy/ Sci-Fi. Teens in same school have strange dreams. Girl (MC) thinks she's invited to fae world. Guy thinks he's abducted by aliens. Read in 1990's. Spoiler ahead. [s]
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Brandie, how far into the book do you learn it's aliens? Is this a spoiler (which is okay in the comments if we provide a spoiler alert first).
Are the main characters friends who go to the same school - or teens from different locations?
Are the main characters friends who go to the same school - or teens from different locations?

You don't actually learn what they are until the end. Some kind of parasite. The alien abduction is just a dream they are creating.
All the kids go to the same school.
Thanks. I added some details to the header/topic title. You can update it by clicking the small "edit" link after the header. This only works on the full Desktop website - not the Mobile website or app. (On the Mobile website, click the "Desktop version" link at the bottom of the page.)
It's about teens being taken over by an entity feeding on their imaginations and convincing them they're dreaming when they're awake. It has a girl as the main character. One of the students thinks he was abducted by aliens. She thinks she's been invited into the world of the fae folk.
Anyone know what I'm talking about?