You can eat perfectly and train hard, but if your sleep is off, your fat loss will stall. This isn't opinion — it's biology. Sleep is one of the most underrated factors in weight management, and understanding why can completely change your approach to losing weight. The Sleep-Weight Connection When you don't get enough quality sleep, your body undergoes a cascade of hormonal changes that directly sabotage your weight loss efforts. Ghrelin spikes.  Ghrelin is your hunger hormo