Hi....., excessive yawning is due to drowsiness, sleeplessness, fatigue etc....., The exact cause of excessive yawning isn’t known. However, it may occur as result of sleep disorders, such as sleep apnea or narcolepsy....... Stick to a sleep schedule. Keep your bedtime and wake time consistent from day to day, including on weekends..... Avoid or limit caffeine and alcohol and don't use nicotine.....