Why is this not a safety issue?
If you have a duty day starting at 2300, you can legally do, whatever the numbers of hours duty the table says...for arguments sake, lets say 10 hours.
Fine, but you got up at a normal body clock time of waking, we shall say 0800-0900, then you have to wait all day, all be it in your hotel, and then go to the the airport for 2300.
How can you be at your sharpest after having been awake all day?
Yes, you have had the legal rest, but in reality, you are close, if not passed your normal time for going to bed, and now you are about to start a duty period.
It is not like you could have just slept during the day as you were not tired at 1300 because you went to bed at a normal time the night before and woke up at a fairly normal time this morning...
Can someone explain why there is no real safe guard for this?