Hariette works nights at Costco to restock the shelves before the store opens in the morning. She asks a sleep specialist about using melatonin to help her fall asleep during the day. What would the sleep specialist likely tell Hariette? 

There have been few cases of melatonin toxicity. 

A & C Few studies have indicated that long-term melatonin use is safe. 

Melatonin is recommended for people working night shifts.