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Dangerous practices and games at school. Three separate categories of dangerous games can be distinguished. The non-oxygenating or fainting games, which consist of mechanical compressions or strangulative mechanisms. These are performed in the search of pseudo-hallucinogenic sensations. There are several such games from the simple but non-the-less dangerous "tomato game", performed by younger children (from 3-4 years of age), to the "choking game", between 7 and 14 years of age. "Aggressive" or "violent" games which use physical and ps

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In this paper, we propose a novel method of automatic sleep stage classification based on single-channel electroencephalography (EEG). First, we use marginal Hilbert spectrum (MHS) to depict time-frequency domain features of five sleep stages of 30-second (30s) EEG epochs. Second, the extracted MHSs features are input to a convolutional neural network (CNN) as multi-channel sequences for the sleep stage classification task. Third, a focal loss function is introduced into the CNN classifier to alleviate the classes imbalance prob