I'll today take a day-off from reporting on our Diamond Princess cruise, and instead provide summaries of cruise-related matters of possible interest to you. I saw a   New York Times  article  indicating some concerns about melatonin.   Five years ago I asked my doctor about the effectiveness of melatonin to help me get to sleep.  He seemed encouraging, so I bought a bottle.  Never opened it. Last year, I took a long trip, including a 38-day Norwegian cruise from Seattle to Southampton, followed a couple days later by a 12-day Viking European Christmas River Cruise from Amsterdam to Budapest. On about the 30th day of the Norwegian cruise, I began to have difficulty sleeping.  Why I still don't know.  But zero to two hours sleep/night can totally screw up your system, especially if this goes on for two weeks. I'm sure I would have taken Melatonin if I had brought it with me on the trip. This difficulty continued the full length of Viking cruise. I ...