Which of the following statements about cognitive-behavioral therapy for insomnia (CBT-I) regarding difficulty falling asleep is correct?

CBT-I only helps with waking up at night and does not affect time to fall asleep.

CBT-I is unproven and has no demonstrated benefits for insomnia.

CBT-I has been shown to reduce the time it takes to fall asleep (sleep-onset latency).

CBT-I works only by adding sleep medications to the treatment plan.