The Pavlok wearable device has a Silent Alarm Clock feature that wakes you up at the optimal time for feeling rested and alert. It uses aversion technology to help you break bad habits, and it tracks your sleep and daily activities through a mobile app. That means it can be used for a variety of purposes, including helping you stick to a regular wake-up time and improving overall productivity.
Another good choice is Sleep Cycle, an alarm clock and sleep tracker that analyzes your sleep patterns to wake you up during your lightest sleep phase. That means you'll wake up feeling rested and refreshed. It also has features like identifying who's snoring and offering resources on various sleep-related topics to help you get the most out of your sleep.
Both Pavlok and Sleep Cycle have scientifically validated features that can help you wake up at the best time for feeling alert and refreshed.