A researcher in pivotal sleep studies is scheduled to speak Tuesday night at Gonzaga University about why enough nightly slumber ties into brain wellness. Jeffrey Iliff, a sleep researcher at the University of Washington School of Medicine, plans to share new findings and advice on how to ensure the right type of sleep that's needed for the brain to function at its best. For audience questions, he'll be joined later by Dr. Don Howard, a Providence sleep medicine specialist and pulmonary doctor. The 6 p.m. Next Generation Medicine lecture, hosted by the UW School of Medicine and GU health partnership, is scheduled at the Myrtle Woldson Performing Arts Center.