Just to throw this out there as possibly unknown as well, if you're in a lower level dungeon and will be helping by sleeping a mob or two, right at the exact end of the casting you can also tag the mob with aero. So he sleeps and aero ticks away, without having to cast aero, GCD, then sleep casting.

Same concept as Cure then slipping in DS before the cure "hits". I haven't tried this one yet, but sleep + aero tag I do every time.

Great tips BTW. Keep them coming.