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Wouldn't rule something like that out, but there are soooo many reasons one might nod off during the day
Including anything that interferes with proper sleep.
About a year ago I somehow mangled my ankle, and that was enough to wake me up several times each night, so I had trouble staying awake during the day.
So in and of itself at least, it's just too non-specific a symptom to read much into it. But it's not inconsistent with some heart ailments.