Other than resting your body, a properly optimized sleep cycle can give you so many other benefits. Illness like sleep deprivation has the ability to cut down the efficiency of your immune system for instance. And as a result your body will be more easily exposed to outside germs and bacteria type harmful infections. Not only that as a result of not getting enough sleep can also be the case behind (after some time) some types of heart disses and even diabetes. Depression is another well known side effect. Although these are just a few to mention but still because of their ability to affect our lives I think even these 4-5 examples would be enough to point out the importance of this matter.
The position that you sleep on your bed itself can give birth to few physical discomforts and if continued for some time it can result in back pain, breathing problems, etc. So what is the best position? Well this depends on the individual. For instance if you have some physical disabilities or some sort of physical problem please always get the proper advices from your doctor. Anyhow for most of us it is said that while lying on your bed using a similar approach to the