By Laura Ng

We spent one third of our life sleeping -- an activity that's seemingly useless. But we need sleep as much as we need oxygen and food. Sleep is important to us. It increases one's work efficiency, extends one's lifespan, cures illnesses. One should not deprive him/herself of sleep.

But during our lives, we will experience some sleepless nights which are considered normal. But for some people, poor quality sleep is a recurring or even a lifelong problem.

When your sleep quality is affected, the end results could well be feelings of fatigue during the day, irritability, poor memory, loss of productivity and loss of interest in family and social life.

Thus, focusing on improving your sleep quality is very important to your health. The quality of sleep is associated with number of sleeping hours. Doctors normally recommend that adults should need 7 to 10 hours of sleep daily and children would require more hours. But it varies among individuals. What matters is, for the duration you sleep, are you achieving the right quality of sleep?

Insomnia, or the inability to sleep well, is a common problem which could affect anyone at one time or another. A person with insomnia may have difficulty falling asleep or staying asleep, wake up frequently during the night, or wake up earlier than desired the next morning.

There are two kinds of insomnia, acute insomnia and chronic insomnia.

Acute insomnia, which can last from one night up to several weeks, may be caused by:

1. A single stressful event

2. A period of emotional stress