Hi there, i take Venlafaxine XR 75mg, one at night time. I did not think to mention to the doctor that i take this medication when he asked if i was on any medication...my GP sent me to this man for a sleep apnea test because i told him i was just sooo tired all the time, i woke up just in time to pull my car back onto the road the other day. From what i have read up, it is these pill that are making me more sleepy then normal, (i have always been a bit of a sleepy person), should i cancel my sleep apnea test.