Do you sometimes fall asleep in an instant perhaps when you are only taking dinner or writing something? Like insomnia, you also need some medication and probably you need to buy modafinil for that, but first you need to ask your Doctor regarding with your sleeping disorder so it would be corrected early.,
I have experienced that one time in my life but it was because I lacked of sleep all the time for I was working in a night shift. There was one time that I attended a mass and suddenly I fell asleep while standing, I feel like I was hit by a piece of wood in my knees that it bend, my sister really thought I felt dizzy and collapsed. But no, I just fell asleep, it happened to me in the call floor as well, I was typing and yet I was asleep, I just noticed that I was already sleeping because the technician on the other phone repeatedly said hello. That was embarrassing and totally it could possibly gave me a negative remark towards my work, good thing the QA didn’t hear my call that night otherwise I could be fire from my work for that.,
Thus, if you have this kind of illness, you should not try to work in a call center or in a night shift because it could ruin your health more.