Protein Found to Regulate Sleep, Anxiety Brain peptide may be target for new drugs to treat insomnia, ADHD    HealthDayNews -- A brain protein that regulates sleep and anxiety may offer a target for the development of new drugs to treat conditions such as sleep and anxiety disorders and attention-deficit hyperactivity disorder.    In research with rodents, University of California, Irvine scientists found that neuropeptide S (NPS) increases alertness, suppresses sleep and controls stress response...