This is a single-arm, observational, feasibility study to evaluate if the Halo Alert System can be used in the future to detect stroke events in individuals at risk for stroke wearing the Halo Alert System overnight. The Halo Alert System consists of an EEG sensor headband (Muse-S headband from Interaxon, Inc., Toronto Canada) paired with a data transfer device (Zeit Loop, Zeit Medical, Inc., Redwood City, CA).