Teeth grinding is considered to be an unconscious response to anxiety or stress. People who grind their teeth while awake often do so due to emotional or stressful situations. Some also grind their teeth when concentrating on a task.
Teeth grinding that occurs during sleep is more common than daytime bruxism. It is the body’s unconscious reaction to stress that has carried over from the person’s awake state.
Risk factors that can trigger nighttime bruxism include the heavy consumption of caffeine, alcohol, or nicotine. Teeth grinding can also be caused by sleep disorders, like sleep apnea. Age is a risk factor because children are more likely to grind their teeth than adults. Most of them grow out of it by the time they reach adulthood, though.
A person’s personality type can also increase their risk of teeth grinding. For example, people with hyperactive, aggressive personalities are more likely to grind their teeth.