How much sleep do we really need to stay Healthy!!!

Everyone should be well aware about the importance of good sleep for our physical health, mental health, and for our long life. This book on sleep projects upon the following points:

The amount of sleep we really need
Stages of NREM and REM sleep cycles
Things happen to us during sleep
Harmful effects caused by lack of sleep
Insomnia symptoms and ways to deal with it
Recommendations to get good night sleep
Effects of factors like aging, travelling, jetlag etc. on sleep