For me, flashbacks that happen just as I'm waking up haven't been as upsetting or bad for me. I'm more relaxed and receptive in that state. I feel mostly sad, and not as scared. Don't know why. No reason for that I can find.
The ones that hit while I'm active in the middle of the day are downright confusing and upsetting to all involved. I'm having to fight them and just let them come at the same time, while juggling my daily responsibilities. It feels like a huge traffic jam in my being. They last longer as I push-pull and seem to switch into different personalities or ego states as they take over.
The night ones make sense when I awake, and I just accept the memory and have a kind of peace about it. Maybe it's the sleep hormones.
When they happen during awake times, it's the same content, but I get cold, hot, chattering teeth, then super cold, like I'm actually a corpse in a fridge who maybe came back to life and is DAMN cold now. I once got into the hot bath still wearing my winter robe and was shaking and teeth chattering for about 30 minutes in that straight, hot water.
My T said to drink ice water to fight dissociation, but not in that state, my friend! No way, no how.
I also don't know if it's normal, (clears throat) but twice now, In flashback, I was actually replaying the memory in my body, and though I could see real life and people around me, it was like a transparency of the past was over them, and I lost control. My body was being run as if I was in the past trauma memory, and I was screaming, fighting, punching, cursing, and doing whatever I did back them.
I'm told this is not just a flashback but an Emotional part of the personality "taking over the controls" by being triggered in flashback.
During sleep, at least I haven't attacked anyone or been saving someone's life, like I have in waking ones. :/