Log bedtime and wake times, optimize circadian sleep targets, and visualize rest quality 100% privately in your browser.
Sleep is the single most impactful lever for cognitive performance, physical recovery, and emotional regulation. A Sleep Tracker brings awareness to your rest patterns, helping you identify what improves or disrupts your sleep — be it late screens, alcohol, stress, or irregular bedtimes.
Our free online Sleep Tracker stores all data locally using localStorage. Your sleep diary is completely private — no account required, no cloud upload, no data tracking.