This document discusses sleep apnea detection from single-lead electrocardiogram (ECG) signals using machine learning and deep learning algorithms. It analyzes 70 ECG recordings from a publicly available dataset. The document outlines existing sleep apnea detection methods, the advantages of using ECG signals, and proposes a system to collect ECG data, extract features, build models using machine and deep learning, and detect sleep apnea. Key steps include pre-processing ECG signals, extracting time, frequency and nonlinear heart rate variability features, selecting important features, and comparing different machine and deep learning models for sleep apnea classification.