Most of the apps focus on my main interest: sleep. Fleet is an app I made in grad school. Sleep-2-Peak is a simple reaction time task that can detect your circadian component. Mind Metrics is a set of tasks that can be used by psychologists to evaluate psychological states (i.e. memory and alertness). Sonic Sleep Coach is the best alarm clock on the app store and it plays sounds designed to block out noise pollution and give you a deeper night of sleep.