Hello Vashanti, I'm just seeing your message, so I do apologize for the delayed response.
My doctors have mentioned concern about my obesity, especially when we discuss surgery, or even the twilight sleep. I have learned so much about this and realize that there are more fat cells in my mouth and throat, even the tongue.
The tongue can go to the back of the throat and block the throat, hence not allowing air/oxygen to pass through. This can make a difference when trying to sleep or even be sedated, because it can make it impossible to breathe, or even to cause a heart attack.
Janet (sleepapnea.sleep-disorders.net)