A nursing instructor asks a nursing student about the pharmacological approaches for treating sleep disturbances. Which statement by the student indicates a need of further teaching?
1. "Melatonin controls circadian rhythms and promotes sleep."
2. "The drug ramelteon works by improving circadian rhythms."
3. "Valerian is an herbal product that can be used to treat mild insomnia."
4. "Melatonin should be taken in a dose between 0.3 to 1 mg 1 hour before bedtime."