When our body is in short supply of oxygen, we will feel lethargic and weak. Our mind cannot function optimally. This is because oxygen is the fuel to the brain for it to function well.
There will be giddiness with shortage of oxygen to the brain.
When we start to not be able to think with our left brain, it turns over to the subconscious mind.
Yes, hypnosis occurs when we are activating the subconscious mind.