So, I slept a bit better. Woke up 4 times, after intervals of 1.5, 2.5, 1.5 and 1 hour. Then the alarm woke me up. Other things I did besides the brazil nuts were some B-vitamin supplementation (nutritional yeast), having a happy day with good news, and telling myself before sleep to focus on breath and relaxation while sleep. Like giving my brain instructions as one would do for lucid dreaming. It works a bit sometimes. I will have to keep up with this and see what makes a difference over time.