Headspace - Meditation made simple. Brilliant things happen in calm minds.
Sleep Cycle - Bio-alarm clock that wakes you up at optimal times based on your sleep patterns.
Calm - Calm.com can help you reduce stress and increase calm.
Sleep as Android - Common alarm clocks ignore your sleep cycles, they wake you on schedule no matter your are currently in your deep sleep. Waking up from deep sleep is unpleasant, it makes you tired and it may negatively affect your productivity during the whole day.
Pacifica - Stress and anxiety relief through beautiful CBT tools
Pillow for iOS - An iOS companion that helps you sleep better 💤