Thanks for support:)

Based on my observation,
Some people can't go to sleep easily. Their brain is still active and any noise or discomfort can make it harder to fall asleep.
I find that people who are fear to talk in front of people and easily get nervous often have a very activated EEG fast brainwave.
Fast brainwave such as Hi-Beta is associated with nervous, anxiety and fear. Based on my observation, fast brainwaves might cause headache too.

Some people don't experience much "relax" mode because either they asleep or awake.
When I look into their EEG brainwaves during neuro-hypnotherapy process, their parietal lobe of the brain shows spindling beta brainwaves.
This could reflect sensory hypersensitivity (Auditory, visual or kinesthetic). Thus, it could be the reason that makes them a light sleeper.
After doing the EEG biofeedback (Increasing the high-frequency sleep spindles) or hypnotherapy, most of them notice significant improvement in term of emotion and sleep pattern.