Answer: As Thomas falls asleep at the beginning of Chapter 15 of "The Maze Runner," he is worried about several things. One of his main concerns is that he and his friends will never be able to find a way out of the maze and escape. He is also worried about the safety of his friends, particularly Minho, who is out in the maze and has not yet returned. Thomas is also concerned about the strange dreams he has been having and what they might mean. Additionally, he is worried about Gally, who has been acting increasingly strange and hostile towards him and the other Gladers. All of these worries contribute to Thomas's sense of unease and make it difficult for him to fall asleep.
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