Please don't ask for medical advice on the web. Please ask you doctor, or even your pharmacist. I hope you told the doctor prescribing trazadone all the medications you are taking.
While it is possible that someone reading you post will be able to tell you what they have done relative to your question, but even if they understand fully and make an error free post, you question is too important for an answer over the web.
One over-the-counter suggestion, with AFib there is a higher risk of blood clots and the lowest level of protection is to take an aspirin a day. I take my aspirin in the morning with breakfast, and yes I do this with my doctor's approval. The aspirin bottle has a warning not to take long-term without first getting approval from your doctor. Aspirin with food doesn't upset my stomach, you may have a different reaction, some do.
Good luck,
Not sure what trazadone is, but I have sleep apnea and have been told not to take a sedative, so that one's breathing is not further depressed. You might want to ask for a referral to a cardiology related sleep center. I was referred by my cardiologist and it was a much more thorough study. I learned that 1/3 to 1/2 of all afib is caused by sleep apnea. My apnea is much more controlled than before. Also, make sure if you have any tests or situations where you are put out, such as cardioversion, that they are aware of your sleep apnea. If your brain can't wake you up, extra precautions need to be taken. All that said, Jerry is giving you excellent advice. Talk to your pharmacist or physician. Good luck.