Drowsiness refers to the state of being sleepy or the state of minimal concentration. It is characterised by a decrease in a person's memory capacity and brain information processing speed. These conditions cause hazards in the real‐time working environment such as driving, monitoring power generation and patient health etc. These hazards can be sidestepped by introducing the automatic drowsiness detection system. This Letter suggested the electroencephalogram (EEG)‐based automatic drowsiness detection method. The clustering variational mode decomposition (CVMD) explores the non‐stationary behaviour of EEG for drowsiness detection. In CVMD optimum allocation sampling analyses non‐homogenous EEG signals and converts those into homogeneous EEG clusters. These clusters are then decomposed into band‐limited modes. The oscillatory mode characteristics are extracted in terms of several features. These features are fed as input into the least‐squares support vector machine classifier. The proposed method provides better drowsiness detection performance in comparison with the different methods using the same data set.

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