This document describes a GUI developed in Python for reading and viewing EEG and PSG signals in EDF format. The GUI allows annotations to be made in time records, loads and saves annotations to a text file, filters data, and generates a PDF report with statistics. PSG is a sleep study that measures physiological variables during sleep from an 8 hour EDF recording containing signals like EEG, EOG, EMG, and ECG. The GUI displays patient and signal information after loading an EDF, allows viewing selected signals by adjusting amplitude and time windows, and reading, adding, deleting, and filtering annotations for events like sleep states and patterns. It can generate a PDF report showing the distribution of events by sleep state and in time