Machine keeps turning itself on

Hi all.
My machine is mostly left on, but last night before bed I turned it off. A few minutes later it turned itself back on. I got back up and turned it back off, went back to bed fell asleep, and not long later I woke up to find it had turned itself back on yet again.
My husband is a Mac technician but even he was stumped. He had a quick look over it this morning before leaving for work but couldn't work it out. He's going to ask the guys at work and research into it but I thought I would post in here and try and get some more insight into it.
And yes, he's a tech but hasn't had this problem into the workshop before, so hasn't had to deal with it.
Any help?

Does anyone else have any ideas on this issue?
Hubby thought it could have been an issue with something I had plugged in (external monitor, backup drive, USB hub etc) so he unplugged those and turned it off, but it seems to have still turned itself back on.
He also asked the guys at work and they have only heard of it happening in desktop machines, not in laptops.
I haven't as yet tried the SMC reset, waiting to hear what hubby thinks on that

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