Which of the following represents a type of insomnia?

Correct answer is B) Insomnia is defined as a sleep disorder marked by difficulty falling asleep. Insomnia is a common sleep disorder characterized by persistent difficulty initiating or maintaining sleep, leading to impaired daytime functioning. It can manifest in various types, including difficulty falling asleep (initial insomnia), waking up frequently during the night (middle insomnia), waking up too early and being unable to return to sleep (late insomnia), or experiencing non-restorative sleep.