Yes they do, but the only noticeable spikes are around Thanksgiving and Christmas. We usually go from one domestic disturbance to another the week of Thanksgiving. On the actual day of Thanksgiving, it usually calms down somewhat, but the day after Thanksgiving? We call it "Black Friday Rumble". There is an inordinate amount of domestic calls on that day pretty much from the stroke of midnight and continuing thru the weekend. Christmas is a very busy time also. Unfortunately, in addition to working lot of domestic calls around Christmas, the number of suicides goes up sharply. From just after Thanksgiving until around New Year, we work almost as many suicides as we work in any other three month quarter throughout the year. What I mean by that is, say we work 25 suicide cases in the month of October, 5 of them successful and 20 unsuccessful attempts (Overdoses, cut wrists, etc.), between Thanksgiving and Christmas we usually work around 75-100 suicides. A lot of them are attempts, cries for help, whatever you want to call it, but the number of successful suicides goes up sharply which is unfortunate.
What is even stranger and half the board won't believe me on this one, but I work in the division that runs stats for the whole department, so I can say this is true because statistics don't lie if you run the same query the same way every time. The full moon 100% absolutely brings out the worst in people. We've got several statistics databases we run queries from on all major crimes: Rape, robbery, arson, homicide, burglary, B&E, a few others. If you graph these out around the full moon every month, you can see a spike around every full moon every month and it goes back ten years, at least until 1998 when is when we went to the record management system we currently use. During the full moon, arguments turn into fist fights, fist fights turn into knife fights, knife fights turn into gun fights. People who usually just argue with other people when they're drinking will end up beating the hell out of one another during the full moon. I'm not stating absolute causation here but I'm saying there is a correlation between rising crime and the full moon. I'll set my watch and warrant by it.