I recently had a pace maker implanted and I have to take Metoprol once a day. The stuff can leave me feeling like I’m pushing a freight train uphill. I think I’ll take before I go to bed. You’re on to something there.
Are you on a CPAP machine? Since I've started that, my sleep has been vastly improved, as has the decline in the need to pee every couple hours in the night. Sleep apnea is (surprise to me) related to the development of heart problems including CHF.