In psychology, "sleeplessness" refers to the condition of chronic insomnia or persistent sleep difficulties that significantly impact an individual's physical and mental well-being. It is characterized by the inability to fall asleep or stay asleep, resulting in sleep deprivation and its associated consequences. Sleeplessness is a prevalent issue with multifaceted causes and consequences that extend beyond simple fatigue. In this article, we will explore the concept of sleeplessness in psychology, provide examples, discuss potential risks and application areas, offer recommendations for managing and treating sleeplessness, and briefly touch upon historical and legal perspectives. Finally, we will list some similar psychological concepts related to sleep and its disorders.