"Dreams Within Dreams" provides a group of heroes with the first hints that ther eis something more to dreams and nightmares than images caused by eating a big meal right before bedtime. It brings them into contact with the first level of reality. One here who experiences a nightmare also catches the interest of Hypnos, a member of the Nightmare Court. This leads to another revelation - dreams can have profound and even dangerous affect on the waking world.
Adventure I: Dreams Within Dreams From Book Three: Book of Nightmares: https://www.adventurelookup.com/adventures/the-nightmare-lands
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