|Sleep dysfunction is also known as sleep disorder or somnipathy, it is a medical disorder. Sleep dysfunction effects normal physical, mental, social and emotional functioning of humans. This is normal disorder and usually temporary, may be caused due to stress or other factors. Sleep dysfunction is of many types which include dysomnias, parasomnias, circadian rhythm sleep disorders insomnia and sleep apnea. Scholarly peer review is the process of subjecting an author's scholarly work, research, or ideas to the scrutiny of others who are experts in the same field, before a paper describing this work is published in a journal. The work may be accepted, considered acceptable with revisions, or rejected. Peer review requires a community of experts in a given (narrowly defined) field, who are qualified and able to perform reasonably impartial review.