Example Mo (MEG‐only) and ME (MEG+EEG) spindles. For clarity, selected spindles in sample referential EEG and MEG gradiometer channels are highlighted in gray. Broadband (A) and 7–15 Hz bandpass (B) recordings are shown. Complete recording profiles are shown in Supporting Information Figures 1 and 2. L (Left), M (Middle), R (Right) F (Frontal), T (Temporal), C (Central), P (Parietal).