During times of cold weather, it is easy to overlook dehydration. If a person is not sweating and remains cool, it is easy to forget that nothing has been drank all day.

In warmer weather, the airplane will likely be hot and have no air conditioning. Heat exhaustion and heat stroke occur suddenly. Under normal circumstances, a person is able to stop working and take action concerning dehydration and overheating. In an airplane, however, the pilot must continue to perform in order to land the airplane. He or she is unable to deal with the overheating on the spot.

For this reason, it is a good idea to take along a some cold drinks, such as water or Gatorade-style drinks, which are well suited for keeping a person hydrated. Drinks such as coffee, soda, milk, or energy drinks should be avoided, since they are not the best for staying hydrated. These types of drinks may even cause dehydration.

Stay aware of your level of hydration, instead of waiting to become thirsty. Two to four quarts of water per day is recommended for the average person. However, each person's body manages their hydration with different efficiencies. Some people might require more or less. Extra water should be consumed to compensate for physical activity and loss of water through sweating, as well.

Symptoms of dehydration include headache, fatigue, cramps, sleepiness, and dizziness.

Heat Stress

If a person begins to overheat, they will enter the first stage of overheating, heat stress. Heat stress occurs when a person's body temperature is one or two degrees above normal. A person with heat stress is less alert, makes decisions more slowly, and often has impaired vision and coordination.

Heat Exhaustion

As the person continues to overheat, the problems become more severe. The person will exhibit symptoms based on the individuals reaction to heat exhaustion. Some people will become tired or faint, while others might become careless and giddy. Rapid breathing, cramping, and nausea or vomiting may occur. A person with heat exhaustion has a body temperature between 101 and 105 degrees.

Heat Stroke

If the body temperature exceeds 105 degrees, the body will encounter the limit to its ability to cope. The person will become confused and exhibit strange behavior. They will likely become disoriented, and may report no longer feeling hot, or even feeling cold. Heat induced coma follows.