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 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...