... opening the window, or turning on the air conditioner are effective ways to stay awake when driving.

These "aids" are ineffective and can be dangerous to the person who is driving while feeling drowsy or sleepy. 

It's best to pull off the road in a safe rest area and take a nap for 15-45 minutes. Caffeinated beverages can help overcome drowsiness for a short period of time. 

According to sleep experts, teens need at least 8 to 10 hours of sleep each night, compared to an average of seven to nine hours each night for most adults. 

Their internal biological clocks also keep them awake later in the evening and keep them sleeping later in the morning. However, many schools begin classes early in the morning, when a teenager's body wants to be asleep. As a result, many teens come to school too sleepy to learn, through no fault of their own.

Difficulty falling asleep is one of four symptoms generally associated with insomnia.
The others include waking up too early and not being able to fall back asleep, frequent awakenings, and waking up feeling unrefreshed. 

Insomnia can be a symptom of a sleep disorder or other medical or psychological/psychiatric problems, and can often be treated. 

Excessive daytime sleepiness is a condition in which an individual feels very drowsy during the day and has an urge to fall asleep when he/she should be fully alert and awake. 

The condition, which can occur even after getting enough nighttime sleep, can be a sign of an underlying medical condition or sleep disorder such as sleep apnea. These problems can often be treated.

Studies have found a relationship between the quantity and quality of one's sleep and many health problems. 

• Insufficient sleep affects growth hormone secretion that is linked to obesity; 
• Blood pressure usually falls during the sleep cycle, however, interrupted sleep can adversely affect this normal decline, leading to hypertension and cardiovascular problems. 
• Insufficient sleep impairs the body's ability to use insulin, which can lead to the onset of diabetes. 

While sleep patterns change as we age, the amount of sleep we need generally does not. 

Older people may wake more frequently through the night and may actually get less nighttime sleep, but their sleep need is no less than younger adults. Because they may sleep less during the night, older people tend to sleep more during the day. 

The body rests during sleep, however, the brain remains active, gets "recharged," and still controls many body functions including breathing. 

Waking up in the middle of the night and not being able to go back to sleep is a symptom of insomnia. 

If you do not fall back asleep within 15-20 minutes, you should get out of bed, go to another room and engage in a relaxing activity such as listening to music or reading. Return to bed when you feel sleepy. Avoid watching the clock.