Dude if this is true - You are a chosen one
I had simmilar situation some time ago when i got in to LD for real. I got to a point that i was aware even in non-rem phases - it wasnt always plesant but i didnt complain... With time it passed away.
Its usually like this that having a great gift is sometimes hard for the gifted one. Like predicting the future or talking with ghosts - people that have this gift dont always want it - like in your case.
I think that You have to learn to use it.
I can recomend trying few things :

1. Easiest - Try to get some sleep in a dream
- i've tried this few times ( well i tried to relax and meditate ) and usually i finished loosing awareness.
Just find a place to lay down and try to sleep.

2. Harder - Find your Dream Guide and ask him to help you. DG can do wonders! Belive me they know what to do. Its not always easy to find your real DG.
My DG helped me once when i visited him - i felt that im starting to wake up - i asked him - Ben (thats his name) is there some thing i could do to stay here longer - i explainded that im starting to wake up.
After that he tooked out a very strange artefact (dont know how to call it) - this was a kind of horn or tube shaped tool he used - i will not try to describe it couse this kinds of tools dont exists in our real world. Any way he tooked this tool and placed it by my ear or the side of my head and he started to blow air on the other side. It was the stranges thing ive ever felt - i heard strange noises exacly in my head - just like he was pouring some astral energy in my head. Moments later i was stable in my dream again.
I have no idea how this works but it realy does
Im sure your DG can put you to a deep restfull nonaware sleep if you will manage to find him. (that shouldnt be a problem for some body skilled like you)

3. You coul try some herbs - for example Mug Wort in my case makes my sleep much more deeper - but still vivid. Hmm i shouldnt say this but - MJ woud probably be the best if you just want to kill your dreams, but for the love of God! dont do that!!!

Learn to use your gift.

If i can ask - how old are You?
BTW This tribe You are talking about is probably Xhosa - fantastic peacefull tribe - as from what ive read.
I hope this helped.