Many people fail to realize that they are putting both their mental and physical health at risk by not getting the sleep they need. Serious health problems such as heart disease, obesity and depression are associated with sleep deprivation.  A lack of sleep can also weaken the immune system, which increases vulnerability to disease.

While the amount of sleep varies individually, most people need seven-to-eight hours of sleep each night in order to maintain good health.

A variety of factors can lead to sleep deprivation, including stress, change of environment and illness.  If you notice a change in your mood or you are frequently struggling to fall or stay asleep, there are several initial steps you can take in order to improve your sleep on your own.

First, establish a bedtime routine that includes “wind down” time before bed. Avoid caffeine and exercise in the evening, as both are stimulants and make it more difficult to fall asleep. After consulting a primary physician, you may want to try an over-the-counter sleep aid, such as melatonin , which is considered to be a natural sleep aid. If problems persist, you may need professional help to resolve your sleep issues.

http://longevitymag.co.za/i_columnists/sleep-on-it/

http://www.webmd.com/sleep-disorders/excessive-sleepiness-10/sleep-supplements-herbs?page=2