This grouped bar chart shows how average sleep duration varies across three stress-level bins (low, medium, high) for females and males, revealing that higher stress corresponds to fewer sleep hours. Built with D3 v7 and React, the visualization loads CSV data via `d3.csv`, aggregates with `d3.rollups` and `d3.mean`, and renders SVG bars through `d3.scaleBand` and `d3.scaleLinear`. A Tableau10 color scale encodes gender, while value labels and a small legend clarify the comparison.