The free version contains the full featured app which is simplified to streamline the process of taking 10 minute naps. Note: it has been determined that this app is not compatible with all android devices. Apologies for any inconvenience. Please uninstall if the timer fails to start. Apparently there is a bug in audio plugin used in the app.
An in-app purchase is available that provides guidelines based on the authors decades of personal research, some of which was presented in the "Power nap" section of the author's 1998 book, "Brain Dancing". The tips activated with the in-app purchase include:
* The 6 principles of effective power napping.
* Review of Google's nap pods based on these principles.
* How to avoid disrupting circadian rhythms when napping.
* Answers to FAQ covering the research that went into designing PowerNapp such as why there is only a 10 minute option, and no snooze button.
Includes high quality recording of ocean sounds from remote Pacific beach for drowning out unwanted ambient noise.
If you choose not to use the ocean sound for napping, it can also be used as background noise while working, or to help get to sleep using the "Silent shutoff" and "Continuous Play" options.