Mindfulness Meditation for Insomnia

All participants will access the a smartphone app, and the mindfulness meditation practice may involve techniques such as breathing exercise, imagery, body scan, and relaxation. The investigators will provide instructions for participants who are assigned to practice at bedtime.

The guided mindfulness meditation practice will also be based on the same app. The investigators will not provide instructions for participants, and they have complete freedom to use the app as real-world users.

Sleep hygiene education will be based on recognized, general, non-personalized sleep hygiene advice, for example, recommendations about bedtime routines and use of alcohol and caffeine, tips on creating a sleep-conducive bedroom environment.