Teeth grinding (bruxism) can cause problems with sleep if it results in frequent awakenings. It also damages the teeth; a mouth guard used at night can prevent this. Bedwetting (sleep enuresis) is common in children and usually of no long term consequence. Snoring can occur in the absence of sleep apnea (“primary snoring”); this may not be a problem for the sleeper if he or she is not awakened by it, but can disrupt the sleep of bed partners.