Hello doc. I have been frequently yawning for the past 1 month or so. This happens every day and it mostly starts after 4pm. I don't yawn so much in morning times but its not controllable during evenings and until I sleep. My eyes become watery and that i feel pain in my mouth doing this excessive yawning. Now that I have some difficulty in breathing today so just wanted to check with a physician. I sleep around 6 - 7 hours a day during nights but still I'm not sure why I yawn so much and so frequently nowadays. Can you please shed some light on this as to what I need to do?