Mayer-Gross

You have intermittent symptoms of depersonalization/derealisation related to anxiety- likely panic. You will not qualify for depersonalization disorder as your symptoms are not experienced as constant and anxiety is present when you have them. 

This site works with anxiety and there are two self-help books related to it that might help you. 

https://anxietynomor..._derealisation/

Well, it is a description in a poetic language that nearly half the text.  The clinical term used in depersonalization is "De-affectualisation that is the subjective feeling of not having emotions any more. Things that matters before and affected ones emotions is gone. It is a "depressive-like" state not related to clinical depression. You lose attachment to the world because there is no emotions to it. 

https://www.cambridg...isorder-div.pdf

Yes. it is a normal symptom in depersonalization. You can read these quotes by philosopher, Henri-Frédéric Amiel' from 1880. He is the one who came with term depersonalization for his state. 

https://www.dpselfhe...amiels-journal/

Some mouths prior I got depersonalization I was in a crisis and I went to some therapy that included dream interpretations. So, I was very aware of my dreamlife. I could remember prior to the outset 2-3.dreams once a night. This changed after the outset to 2-3 once a month. 

Giulio Tononi have mentioned dissociative states in a book he wrote with the late noble prize winner, Gerald Edelman as a state of disintegrations of networks. A poorly integrated "default mode network" has also be mentioned as central in the dissociative subtype of PTSD. So, it is a failure to integrated emotions, sensory input. If the role of sleep and dreaming is integration and organizing such daily input it might be affected by the daily state one is in. I don't think depersonalization is a sleep disorder but the state has affect on sleep.In major depression it is also highly affected.  

I saw changes in frequencies of my dreams I could recall after depersonalization "came into mind",  I could recall them much less. When I by accident tried clonazepam 2.5 mg with duloxetine prior to sleeping I woke up the next morning I felt that I had, had a sleep much more diffrent and of better quality than I used to. I felt much more present and energetic. So, To me there is no doubt that the sleep architecture in depersonalization is affected. Research into depersonalization is very underfunded and a sleep study of the sleep architecture have never been made. Sleep is almost controlled by small areas in the midbrain so it is very old and essential areas that is affected. These areas have never been scanned in depersonalization as they are to small to detect in a 3.tesla scanner. A 7.tesla scanner might see differences. 

I would wish that this researcher into sleep and consciousness, Giulio Tononi could make a study of sleep in depersonalization. It likely have to be done in 15-20. patients to have a high validity. 

His biography; http://centerforslee...ple/tononi.html

His lab site; http://centerforslee....edu/index.html