Fireflybob,
Not at all. I respect the FTLs but I do not think being called an hour before your morning standby begins infringes those limitations.
I'm being practical. Put it this way, it is up to us to plan our lives so that we get enough sleep within the constraints of our rosters. If I am rostered to fly a 6:30am departure and I know I need to get up at 4 to achieve that without rushing, I'll be in bed by 8:30pm. If I'm instead rostered a standby starting at 6:30am I would go to bed at 8:30pm. In that situation if someone calls me at 4am to do a 6:30 departure, even though it's before my standby starts, I'll have had sufficient rest. For the avoidance of doubt, I'm not suggesting I'd get out of bed at 4 'just in case'!
In those circumstances FTLs are unlikely to be relevant because my previous day's flying will have been an early shift.