Sitting yawning is caused by brain fatigue and lack of oxygen in brain cells due to overexertion, and the symptoms can be significantly improved after rest or proper relaxation. Sitting yawning can also be seen in some patients with sleep disorders. Due to poor sleep quality or short sleep time at night, patients can experience daytime sleepiness and sitting yawning. It can also be accompanied by poor concentration and memory loss, and the main treatment is to improve the sleep disorder. Sitting yawning can also be seen in some patients with episodic sleeping disorder. Since patients may have sleep disorder, they may experience daytime sleepiness, yawning, and in severe cases, sudden collapse. Patients suffering from episodic sleeping sickness are advised to schedule some time for rest or napping during the day. Sitting yawning can also be seen in patients suffering from nocturnal sleep-apnea syndrome, which is characterized by daytime sleepiness and yawning due to lack of oxygen during nighttime sleep leading to a lack of oxygen in brain cells.