> My longest dream was nine years compressed into a 12-hour sleep period.

Does the brain change in response to that sleep period? Or is there no change because there's no new information input?

I dunno, I wasn't hooked up to any kind of measurement device to measure the changes in my brain. From a subjective point of view, I miss that place. I've been writing a book about my adventure there, off-and-on for years now. Maybe someday, I will finish it. If I could return, I'd do it in a heartbeat at any cost.

I _feel_ older than I am because there are a couple extra decades in my brain than in real life. Most of my time compression experiments were only a few months or weeks. That one long one changed me forever, and I've never done it on purpose since then.

I still have time compressed dreams from time to time, and when I wake up, two or three weeks have subjectively passed, but only a night has passed in the real world. There's a period of time, no more than 10-30 minutes, while the brain tries to reconcile two different and overlapping pasts. It can be a bit disorienting. My wife knows when I have these dreams because when I wake up, she says I look around surprised or confused to be there. The absolute worst is when you lay down to go to bed in the dream and wake up in the real world. Those will mess you up.

So, maybe my brain did change. Who knows? Maybe someone should study it.