Might be an idea to find a group in Wineport or Costa Del Sol, at least then you don't get lumped with randoms, people do farm this instance for gear so finding an experienced group shouldn't be too bad

I have horrible memories of getting the the final boss and literally spamming Cure I waiting for the Cure II proc simply because I had no mana left!

In regards to sleeping, you can make a macro which says something like "Sleeping [insert mob name here]" which might help slightly. Don't ask me for the proper macro because I'd have to google it

Good luck with your instancing x