at night your body begins to wind down, blood pressure lowering i'm sure is part of that process. if you were feeling that while going about your day, it could be a concern if you feel really dizzy/faint from it. if not, i'm sure it isn't something to worry about.
that is completely normal. I would not worry about it at all.
That is what I am normally, no, it is not too long, as long as you do not feel dizzy, feel like you are going to pass out, or feel short of breath.
As my doctor always tells me, you sure will not have a stroke with readings like that. :)
As long as you aren't too dizzy, it's really ok. I take meds for rate and rhythms control and it makes my pressures run really low. Mine is in the 95/50 range all the time. Never checked when I am asleep. I do ok when I am in that range. If you are dizzy, it is too much. Those are certainly effective drugs for pressure control. Talk to your doc, but if it is too much, take halves as directed by your md. With a pressure low like that... you won't be having a stroke anytime soon. Hope you find yourself feeling much better soon.