What condition is characterized by excessive daytime sleepiness and sudden sleep attacks?

• A. Insomnia
• B. Narcolepsy
• C. Sleep apnea
• D. Restless leg syndrome

Answer: (B)

The condition characterized by excessive daytime sleepiness and sudden sleep attacks is narcolepsy. This neurological disorder affects the brain's ability to regulate sleep-wake cycles, leading to overwhelming daytime drowsiness and spontaneous episodes of sleep that can occur at any time. These sudden sleep attacks can be brief, ranging from a few seconds to several minutes, and may happen during the day in inappropriate situations, making it dangerous in certain contexts, like driving.

In contrast, insomnia involves difficulty falling asleep or staying asleep, and does not primarily feature sudden sleep attacks. Sleep apnea is marked by interruptions in breathing during sleep, which can lead to excessive daytime sleepiness but isn't characterized by sudden, uncontrollable episodes of sleep. Restless leg syndrome involves an uncomfortable urge to move the legs, primarily at night, which can affect sleep quality, but it does not result in daytime sleepiness or sudden sleep episodes. Narcolepsy is distinctive in its specific symptoms and effects on daily functioning.