Citalopram does not cause snoring. Snoring is a structural, anatomic issue. when you sleep, the muscles around your neck area relax. the airway, instead of being fully open, gets floppy. it is the sound of air going through a floppy pipe, essentially, that causes the snoring noise. The amount of airway closure that occurs increases if you are on muscle relaxers, drink alcohol, or (most common) if you are overweight. If you are waking up at night and feeling fatigued during the day, as well as snoring loudly, these are all signs of possible sleep apnea, which very commonly occurs in heavy snorers. I would advice seeing your primary care doctor about this in order to obtain a sleep study referral. In the mean time, there are several over the counter anti snoring devices that basically all work by keeping the airway more open. Try those out, I am sure your spouse would appreciate it.