1 Both these new developments cause frequent urination during pregnancy. 2  This adds to the feeling of dehydration and dryness of the mouth in pregnancy. 3  Dry mouth at night during pregnancy could also be the result of some kind of health condition. 4  Dry mouth in pregnancy is not a disease but a symptom.
(June 2015). In the United States, the academic year typically has about 180 school days for K-12, running from the early in the Northern Hemisphere fall to early summer.
The most popular form of year-round education is the 45-15 plan, where students attend school for 45 days and then get three weeks (15 days) off. The usual holiday breaks are still built into this calendar. Two other ways to organize a school calendar are the 60-20 and the 90-30 plans.