Hi Markus!
Your suggestions for reality checks are extremely interesting, I like the thinking behind them, maybe I will try them for myself. Good luck in your own quest!
As for dreams, I remembered last night's dream (hope you don't mind me posting it here):
Background: (it's weird how my dreams all have false histories which are instinctively real to me within the dream. Sometimes these innate histories are quite deep - not last night, however)
I was on a speeding train. There was a mysterious dude hunting me down. (Reasons unknown). I knew I was in a particular carriage and he was approaching the door to this carriage.
The dream started with me seeing through the eyes of the mysterious dude, opening the carriage door hunting for my real self, expecting to see me sat at a table there. But surprisingly I was not there.
My viewpoint then panned out from the dude's eyes, up through the carriage roof, and I could see that I was lying hidden against the rooftop, wind rushing in my face (I experienced the sensations of lying atop a speeding train for quite some time)...
Next thing it cut to a room with a flavour of ageing ancient wood. I was seeing through my own eyes, looking at the mysterious dude, he was going to take my life. He raised an historic looking rifle to my head, I simply looked at him. He pulled the trigger, the mechanism clicked, but there was no bullet. I continued to look at him and he simply left. End of dream.
The memorable aspects were:
1) The feeling of the wind upon me on the roof of the train (even though at that point I was not within myself, so to speak)
2) The old wood of the building in the room. It was not rotten or anything, it just emanated this powerful feeling of history and ancientness (if that's a word!)
3) It felt like adventure and excitement rather than any fear
Sorry for such a long post
, but I am certain that this dream remained so vivid as a direct result of reading this topic last night!