11. Appendix: Notes on the iPod touch and iOS4
If you are using Sleep with the iPod touch, or if your iPhone or iPad is running iOS4, please be aware of the following considerations:
iPod touch
- The iPod touch does not have a proximity sensor, so placing your device face-down on the mattress during sleep recordings will not turn the display off.
- To conserve power, your iPod should be running iOS5 or later which will enable you to use the screen lock to background the application while recording sleep and activity data.
- The iPod touch does not contain a vibrate motor, so the Get Active Alerts will be issued via audible notifications only.
iOS4
- iOS 4 does not support access to the accelerometer sensor while the application is backgrounded, so Sleep by MotionX must be running in the foreground to collect sleep and/or step data. When recording sleep or a walk, the proximity sensor may be used to turn off the display to conserve power if you are using an iPhone.