Final answer:
The provided excerpts don't explicitly mention a character named Sammy nor do they reveal a fear related to the options given. They feature various characters and themes from different texts.
Step-by-step explanation:
None of the dreams mentioned explicitly reveal a fear of Sammy about Dicey leaving him, getting to Grandmother's safety, fear of the dark, or never having a home. These passages are from various texts that deal with different themes and characters. The provided excerpts instead display themes such as the struggle for survival in the cold, the courage to claim space in an unwelcoming home, the loss of youthful dreams and illusions, an individual's connection to nature, the lasting effects of a traumatic dream on faith, the terrors of a snowy night walk, parental concern over their children's obsession with a virtual reality nursery, the heartache of being forced to abandon a home and the defiant claiming of a new living space.