I usually crash at midnight and I'm up by 6 or 7.

The "complex task" dreams you describe I call "frustration dreams". They are the psychological equivalent of assembling a piece of furniture when the instructions are written in Danish, and one vital part not mentioned in the brochure is missing.

One interesting dream phenomenon I've noticed lately is that I will suddenly find myself in a place (a room, house, or geographical location) that I visited in a previous dream months earlier.

And no, It is not a real place in the real world. It is a location that exists only in dream space.