For those prepping their daily alarms, don’t forget about the Daylight Savings bug in iOS 4.1.
For those that are unaware, the Daylight Savings Time bug in iOS 4.0 and later will cause any repeating alarms to go off an hour later tomorrow.
Apple has publicly acknowledged the bug via a support document and a fix has been promised with the iOS 4.2 update due very soon this month.
To avoid the alarm bug, set any alarm intervals to Never in order to set a one-time alarm to avoid sleeping in.
After November 7th, 2010, you can set your alarms to repeat again.