Modafinil is an effective medication that is effective and prescribed for the treatment of excessive sleep disorders.  It is a popular cognition enhancer that helps in increasing focus and productivity. Most Modafinil users have complained of headaches, while headache is a common side-effect of Modafinil, and there can be several other causes for having Headaches. Still, headache is one of the side effects of Modafinil.  Dehydration, changes in neurotransmitter levels, and high blood pressure can also contribute to headaches. There is more to this topic. For more detailed information about Modafinil causing Headache, visit the website of Health Matter