During sleep, the hippocampus is in constant dialogue with the neocortex. This communication relies on the interaction between distinct dynamic events in the two structures: slow waves and spindles in the neocortex and sharp wave-ripples (SWRs) in the hippocampus. We are interested to understand how these intrinsically-generated activity patterns self-organize, how they support information transfer between the hippocampus and neocortex, and how their interaction supports offline learning.