In summary, our study has verified that OSA is an important risk factor for ischemic stroke in general and for WUS in particular. OSA is treatable through weight loss, sleep hygiene, and C-PAP machine applied during sleep. Unfortunately, OSA remains considerably under diagnosed and undertreated Young T, Finn L, Peppard PE, Szklo-Coxe M, Austin D, Nieto FJ, StubbsR,HlaKM