Hi @V3ER,
Power nap triggers the alarm after alarm time, other smart alarm methods trigger the alarm before alarm time.
So for an alarm for 8:00:
One-hour smart period → The alarm will go off between 7:00 and 8:00
Power nap → The alarm will go off between 8:00 and 8:59
If the alarm is at 8:00 with the power nap smart period, the smart period is between 8:00-8:59 - after the alarm.
If the alarm is at 9:00 with the regular smart period of one hour, the smart period is between 8:00-9:00 - before the alarm.
For this specific pair of different alarms with different smart period methods, the smart period is almost the same.