I take my lunch at 1 o clock within half an hour i started sleepiness and sleep in the office my colleague kept waking me up but a few minutes later the same condition is there. I try to keep myself awake but all in vain. This continues 4 to 5 hours only after 6 o clock i wake up fully. I don't know what's happening with me.this condition persists for the last two months.it is very disturbing and i can lose my job as well. I have been taking psychiatric medicine for the last 5 years for stress and depression.but i have never experienced this situation before dr also said this is not associated with these medicines. I have high cholesterol and borderline diabetes,not diabetic. Please advise.