iPhone 4s irregularly asks for Apple ID after a night at airplane mode My girlfriend uses her iPhone to wake her up, and during night, she puts it in flightmode (because she doesn't like radiation).
1 out of approx. 3 mornings the phone doesn't wake her, instead it asks her (silently) for her Apple ID.
The screen shows (in Dutch, so probably not 100% right translated)


  activation required


after clicking at it, it tells 


  Activation required.
  On your iPhone flight mode is active. Turn off flight mode to continue activation.


and after clicking this it asks for her Apple ID. After filling it in, just than the alarm clock goes off (off course to late :(
Strange behavior, especially since I have used this iPhone for a year (it used to be mine), without any of these problems.

Perhaps beneficial information: she has her own Apple ID, but for apps we share an Apple ID.
[iOs 7.04 on iPhone 4s 32GB]
Does not answer question directly as this is possibly a bug with flight mode. Her use case is not what flight mode was made for though?  Better option to keep from being disturbed at night is to Use the Do not Disturb feature form settings.   Configurable and can set it to do automatically during certain times.  Otherwise just manually put the phone in mute mode.

On the flight mode...  I know certain older version of IOS had problems with alarms.   Think it is quite possible that the lack of any network connectivity might block some background processes so can think that it would be reasonable to expect the password at some times.   If it stops n alarm from activating it would be a bug in iOS though.