During sleep, the widespread coordination of neuronal oscillations across both cortical and subcortical brain regions is thought to support various physiological functions. However, how sleep-related activity within the brain’s largest sensorimotor structure, the cerebellum, is multiplexed with well described sleep-related mechanisms in regions such as the hippocampus remains unknown. We therefore simultaneously recorded from the dorsal hippocampus and three distinct regions of the cerebellum (Crus I, lobule VI and lobules II/III) in male mice during natural sleep. LFP oscillations were found to be coordinated between these structures in a sleep-stage specific manner. During non-REM sleep, prominent delta frequency coherence was observed between lobule VI and hippocampus while non-REM associated hippocampal sharp wave ripple (SWR) activity evoked discrete LFP modulation in all recorded cerebellar regions, with the shortest latency effects in lobule VI. We also describe discrete phasic sharp potentials (PSP...