Does Propranolol Cause Sleep Disturbance/Nightmares/Insomnia?

That’s a good question, and I think with any medication, side effects are dependent on dose size. The greater the dose, the greater the chance of having more severe side effects. That being said, I take 10mg of propranolol daily. In the past I’ve also taken 20mg daily. So low doses in both cases. People taking this for HBP can take doses of 80-160mg a day. I have never had any insomnia, nightmares, or weird dreams. The medication just physically slows my body down when it is “amped up”. My wife takes 80mg a day for migraine prevention and she also has not experienced any sleep issues. We are all different, but I hope this helps. If you are worried, sometimes starting on the smallest dose helps your ease your mind. Good luck to you.

Hi, Jules!
They are possible side effects:
"Nervous system
Common (1% to 10% of users): Fatigue, sleep disturbances, nightmares, sleep disorder"
Generally, side effects tend to subside over days to a week or so but if they persist they should be reported to your doctor for professional advice.
I took propranolol for several months for anxiety symptoms while my anxiety medication was becoming fully effective without any problem.
Best regards and I hope you do well.
Wildcat