It has been estimated that the average human brain contains about 100 billion neurons and, on average, each neuron is connected to 1000 other neurons. This results in the generation of vast and complex neural networks that are the mainstay of the brain's processing capabilities. Neurons are the basic data processing units, the 'chips', of the brain. Each neuron receives electrical inputs from about 1000 other neurons.
New research from Italy suggests that low levels of vitamin D may increase your risk of erectile dysfunction. When researchers tested 143 men with varying degrees of erectile dysfunction, they found that nearly half of them were coming up deficient in D, and only one in five had optimal levels of the nutrient.
In fact, improving nitric oxide can have dramatic effects on nocturnal erections as one Cialis study showed. Cialis has a long half life and its efficacy is considered to be about 36 hours in most men. One study showed that men who used 20 mg every other day had dramatically increased morning erections.