Ever wonder why some nights of short sleep feel better than long nights of tossing and turning? It all comes down to the 90-Minute Rule . Our bodies move through distinct sleep stages, and waking up at the end of a cycle—rather than in the middle—is the key to mental clarity and physical energy. At Tool Mentors , we’ve built a dedicated Sleep Cycle Calculator to help you align your schedule with your biology. Whether you are a shift worker, a student, or a busy professional, this tool ensures every minute of rest counts. Stop guessing and start optimizing your sleep today: 👉 https://toolmentors.com/sleep-cycle-calculator/ #Blogging #SleepHygiene #DigitalTools #ToolMentors #SelfImprovement #HealthAndWellness