It is participating and flowing with the activity and stimulation, or the deep relaxation. Every parent can be aware of the environment, the sound environment, for their child. If there are TV's, computers, radios, and even refrigerators heard in a child's room, it can highly disrupt their sleep pattern. Especially if a child is ill. The ear easily receives auditory stimulation in the last trimester before birth.
Many children are hypersensitive to sound, and find each and every sound distracting.
Thus, they are often unable to focus on one activity at a time. This is common with children with attention deficit disorder and dyslexia. Remember to add chants, songs, and a variety of folk music to his daily diet. I have specific albums for different ages. The Mozart effect for newborns, babies, and for children's' study, creativity, sleep time, and movement.