Morale also affects resistances?

Last night I did a few Lv50 pvp on BLM which, admittedly, I have not done since the first day of 2.1, so I could be completely wrong.

That said, I have full i70 for my SCH/WHM, but no gear for my BLM (full i90 pve gear, so accuracy was not the problem). I noticed that against players in pvp gear, my initial sleep would land for 30 seconds (and, of course, be purified immediately), but the next sleep would land for only 6-7 seconds. And after that, they were not landing at all.

If I'm not mistaken, when I am slept repeatedly it's usually for 30>15>7>4 seconds before a complete resist.

Does anyone have input on this?

After 3 sleeps they will be immune.

Theoretically it could be 7 if they had stat capped resist armor, food, and used a ward potion after purify... but I doubt you'd encounter that on a regular basis.

It's possible that some of them may have sleep resistance. I know i will be getting a ton of those before i get accessories.