heartofspades
Regardless of what the limitations are, if you felt that tiredness was affecting you to the extent that it impaired your ability to perform your duties then report it.
On my last flight one of the GR1s came up to the flight deck with a Fatigue Report form as English is not her native language and she asked us to proof read it. I took the time to commend her on putting pen to paper because not enough cabin crew do.
Always remember that anyone can file an ASR too and it is not just a reporting system for flight crew only. ASR forms are carried on every aircraft so there are no excuses for not putting pen to paper. You just need to take a form and fill it in and then hand it to the F/O, who will ensure that it is submitted correctly back in DXB.