Mrs Carpenter is 87 years old and is brought in to see you by her husband who is her carer. She is known to have advanced Alzheimer’s dementia. The Psychiatry team commenced a trial of Melatonin for her insomnia. They want to learn more about the medication as they felt their appointment in secondary care was too rushed.
Which of the following statements about Melatonin use in insomnia is least correct?