I am a layman, but supposedly we have a pineal gland (https://en.wikipedia.org/wiki/Pineal_gland https://en.wikipedia.org/wiki/Pineal_gland). It's main purpose

I am a layman, but supposedly we have a pineal gland (https://en.wikipedia.org/wiki/Pineal_gland https://en.wikipedia.org/wiki/Pineal_gland). It's main purpose is to manage our state of wakefulness based on light reaching our eyes. It manages melatonin levels. I wonder if this device is modulating that system rather than some kind of "altering [of] the brain's electrical oscillations."