In Victor Hugo's "Les Misérables," the experience of a tumultuous day filled with various emotions and concerns leads to a restless night. The quote suggests that while one might initially find sleep after such a day, the continued turmoil makes it hard to settle into a second sleep. This highlights how the mind remains active, burdened by lingering thoughts and worries.

This idea reflects the complexity of human emotion and the struggles of coping with life's challenges. The inability to find peace in sleep serves as a metaphor for the difficulties faced in life, emphasizing the lasting impact of our daily experiences on our mental state. Hugo captures the essence of how emotional disturbances can disrupt our rest and peace of mind.