The quote "I can't sleep. Too many thoughts running through my useless head." from Simone Elkeles' novel "Leaving Paradise" reflects a common struggle with insomnia caused by overwhelming thoughts. It captures the frustration of having a restless mind that prevents relaxation and sleep, a feeling many can relate to during stressful or emotional times.

This sentiment touches on deeper themes of anxiety and the challenges individuals face when trying to find peace amidst turmoil. Characters in literature often grapple with similar battles, and this quote effectively conveys the internal conflict that can arise from overthinking, making it a poignant expression of mental struggle within the narrative.