Sheaths also swell as a result of being dirty.. Horses with large beans (accumulations of secretions at the end of the penis) and large accumulations of sheath smegma (normal pasty secretion) often swell. Horses that urinate into their sheaths tend to have dirtier sheaths and more problems with swelling.
Some people think Alaska has less sunlight than other places. The opposite is true. Averaged over an entire year, Alaska gets 10-17 minutes more daylight per day than the rest of the country. If you include civil twilight, Alaska gets 40 minutes more light on average than the rest of the country.
The first day of winter (the winter solstice) is the shortest day of the year and the first day of summer (the summer solstice) is the longest day of the year. In the United States, there are only about 9 hours of daylight on the first day of winter and about 14 hours of daylight on the first day of summer. During the summer months, the further north you go, the arc of solar travel between sunrise and sunset lengthens and the amount of daylight increases.