Has anyone noticed a real difference in how they feel by timing their sleep around complete sleep cycles instead of just aiming for a certain number of hours? I’ve recently learned that waking up at different points in a sleep cycle might affect how rested you feel, and I’m curious whether using a sleep cycle calculator or planning bedtime based on your wake-up time has actually improved your mornings. How accurate have you found these estimates in real life, especially if it usually takes you 10–20 minutes to fall asleep?