sleep-2-Peak enables researchers and individuals to use scientifically validated tasks on an iPhone or Android devices. sleep-2-Peak is designed to measure fatigue and alertness. sleep-2-Peak Reaction Time This tool allows you to discover what sleep schedule and what periods of the day are associated to your peak mental and physical state. By using sleep-2-Peak, you will become aware of alertness variations beyond what you can feel and you will discover how powerful your schedule choices can be to boost your performances naturally. This task uses a variation of the psychomotor vigilance tasks that has been validated by scientific research.