Dark Wishes - The Dream World Chronicles, #4

After a narrow escape from her enemy, Alex thinks she's faced her greatest challenge yet. But her situation worsens when she discovers her sister wasn't the only one to suffer from the sleep thorn's magical serum. Suddenly, Alex can't stop falling asleep at the most random of times, or seeing the strange dreams that seem to be prophecies. Her visions foretell one thing: total destruction of the dream world, a threat that becomes all too real when nightmare hunters start going missing.
Alex is the only one who can find out why. As her dreams become the key to stopping the mayhem, she finds herself under more pressure than ever before. Can she discover what the enemy is planning, and stop him-or will her dreams of doom come true?