What does chronic insomnia involve?

Chronic insomnia is characterized by sleep difficulties that occur at least three times a week and persist over a longer period, typically involving trouble initiating or maintaining sleep. Among the choices provided, experiencing difficulties waking up too early multiple nights each week is a key aspect of chronic insomnia. This symptom aligns with the overall pattern of sleep disruption that defines the disorder, as it can significantly impact the individual's ability to achieve restorative sleep.

The other options, while they may relate to sleep issues, do not specifically represent the defining characteristics of chronic insomnia. Feeling sleepy during the day can result from many factors, not solely chronic insomnia, and thus does not capture the essence of the condition itself. Having vivid dreams is not typically indicative of insomnia and can occur in various sleep stages, while excessive snoring is more associated with conditions like sleep apnea rather than insomnia. Therefore, the correct choice highlights a specific symptom that is integral to the diagnosis of chronic insomnia.