Developmental Changes in Sleep Oscillations during Early Childhood

Figure 1

Spectrograms, oscillatory events (derivation C3A2), and hypnograms of a boy (same child shown in Supplementary Figure S) recorded longitudinally at ages 2 years (A), 3 years (B), and 5 years (C). For each recording, the following data are illustrated. (a)—top: spectrogram and superimposed oscillatory events (black dots). Spectra are color coded on a logarithmic scale (0 dB = 1 μV²/Hz). (b) Frequency distribution of oscillatory events. (a)—bottom: hypnogram (REMS: REM sleep; LightS: NREM sleep stages 1 and 2; SWS: NREM sleep stages 3 and 4). The dark blue bar reflects a short disconnection of the child.