Nightmares!

I find that nightmares like this are indeed the subconscious sorting things out.  Use it.  You are obviously worried about forgetting something for your first tri. Make sure you have a list, practice all your transitions with everything on the list, then keep all that stuff in one place if possible. If you still get the nightmares, when you wake up, review what happened in the nightmare, and "talk back" to it - e.g. "I know I won't forget the wetsuit because it's in the bin and ready to go".

I love the avatar, btw. Is that you ironing underwater?

1. Make a list.

2. Get all items on the list.

3. Realize that you forgot one of the items.  Panic.  (Is that the only one?) Go back to step 2.

4. Realize that you left something off the list.  Panic.  (Is that the only one?) Go back to step 1.

5. Repeat. 

Totally normal IMO.  And I agree with the above, do your best in this week to eliminate the controllable.  Also consider a prayer/meditation at the end of the day before you go to bed where you are consciously breathing, honoring that you did all you could to be ready in that day, and inviting rest in acknowledging that the rest is a way that your spirit and mind can continue that preparation.  That being said, you may have these substate dreams until you are through the event.  If they do wake you up, take time to breath, acknowledge your fear, and ask yourself, "Am I safe?" (yes), thank your fear for reminding you of the need to be prepared but honestly say to your self - we are ok. 

Might sound a little hokey, but from personal experience (where every Friday for 6 months I would have a dream that I forgot my sermon notes) and my work  in pastoral care - it does help.

You are ready.  You will be race day.  You will do great! 

Oh and for what it's worth, you don't need that wetsuit to swim anyway.

Yes, very common and normal, even healthy I'd say. You're probably right about the subconscious working out its anxieties ... I think of it as getting all the bad vibes, worries and scenarios out of the way before the race so that race day itself is FREEEEE! of them.

Good luck!