The brain of migraineurs likes consistency. Many factors change with the seasons and influence migraines.   Changes in sleep patterns, light, air-pressure, temperature, humidity, and fragrances, can all increase the the frequency and tendency of migraines. Beware of hotter days. A team of researchers at Harvard found that an increase in temperatures occurred 24 hours before increases in admissions to emergency rooms for treatment of migraines.   There is not much a patient can do to control the weather or avoid...