Hi @danafitz . My situation is not exactly as you described but similar. In case it helps: I was on Metopralol (beta blocker) for a while about ... 15(?) years ago. I was suddenly falling asleep at my desk, while driving, etc, after being awake for only about 6 hours. (The details are a little fuzzy since it was so long ago). I got switched to Diltaizem (Tiazac), a calcium channel blocker. I don't remember there being any fade-out-fade-in period between the two. If the memory is correct I just stopped the Metopralol one day snad started the Tiazac the same day, but again, that may not be 100% accurate. After a short time the problem disappeared completely. I've been on the Tiazac every since with no problem. So not exactly the same as you but close. Hope that is useful. Good luck with the switch.