So if I want to entrain my brain to a 21 hertz beta frequency, then I could play 300 in my left ear and 321 in my right.
The two frequencies being played at the same time enter each ear individually and are processed by your brain as a single frequency that merges the two.
In general, I find life without coffee more relaxed and pleasant than being stressed out by caffeine.
During lucid sex, our physical body responds with increased heart rate and often actual ejaculation for males.
Write it down in the morning.
You could use an office notebook, an online journal, a sheet of paper, or even a Dictaphone — whatever seems natural to you.