Title: Importance and effectiveness of brain stimulation in the treatment of depression and insomnia.Objectives: This article is to show the importance of brain stimulation in the treatment of depression and insomnia. Also to reduce the prevalence of depression and insomnia, to show the relationship between depression and insomnia, to bring for a solution to suicide caused by depression, to explore the use of brain stimulation in the treatment of depression and insomnia, to know the effectiveness and side effects of brain stimulation in the treatment of depression and insomnia. But most important purpose of this article is to show the importance and effectiveness of brain stimulation in the treatment of depression and insomnia. Methods and Findings:We went through about 15 articles published from 2006 till date. We used the key phrase brain stimulation in the treatment of depression and insomnia. We reviewed journals from PubMed/Medline, WHO factsheet, psychology today, NIMH (National Institute of Mental Health). We also retrieved articles from journals of physicians, NIMH Researchers, John Hopkins School of Medicine researchers. We acquire results from 7 experiments carried out by psychologists, researchers on the use of deep brain stimulation and cranial electrotherapy for the treatment of depression and insomnia, there were positive results but some of the positive results took time to manifest while some of the experiments didn't have a positive result. This was dependent on the stage of the depression. Further down this article we talked more about the result. Conclusion:In this article it was concluded that deep brain stimulation and cranial electrotherapy can be used to treat depression and insomnia but it doesn't work for every one or it might take longer to bring forth a positive outcome. Therefore further research should be carried out on the use of deep brain stimulation and cranial electrotherapy to cater for different stages of depression and insomnia.