There may not yet be a cure for insomnia, but researchers are a step closer to predicting who is most likely to suffer from it -- just in time for World Sleep Day on March 13. Researchers note that we should all keep abiding by the habits already acknowledged to promote a good night's sleep: "Avoid sources of stress when going to bed, preserve the bedroom environment for sleep and not for work, and avoid stimulation. Find ways to relax before going to sleep."