Hiya Nicole and thank you for responding. I haven't changed any of the monitors settings since I purchased it a year ago. Also there is no way for the monitor to know the time and as this happens at exactly the same time every night then I very much doubt it's on a timed power saving mode/setting. Since this started I have affixed the monitor to a stand on wheels, not that that makes any difference lol, so it was unplugged from the power cable and DP cable.
When I reattached the cables I changed the kettle plug for one that locks into place into the monitor, I don't why these aren't a standard fitting nowadays, and although it's never come out I thought it was better safe than sorry.
It could be a program that's sending/receiving and it does it at that time every night so tomorrow, or later today lol, I'll check each of my app's to see if I can track it down and hopefully it's one of those. As I don't really know when this actually started I will work backwards with software/firmware I've installed.
I run a paid for antivirus suite and a lifetime subscription to Malwarebytes Pro and neither of them have flag up anything for a long time now.
Hopefully what I've said makes sense and if you have any other idea's what the issue might be then I'd love to hear your thoughts Nicole.
Cheers.
Pete