In every evening, when I go to bed, I get
immediately a strong Super-O. wakes up It lasts for about 1.5 hours and I manage to fall asleep after that. Every morning around 3 or 4 am when an exceptionally loud train wakes me up, I still feel some kind of tingling in my body. In the morning, a certain very strong erection and a certain feeling of sweating and I feel my body really relaxed. Can this really happen or is my brain playing tricks on me?
Most everything related to sex/ sexual pleasure is a product primarily of the mind. 1% between the legs; 99% between the ears.
If your mind is registering and contributing to prostate pleasure, don't overthink everything. Just enjoy and learn to interpret all the subtle sensations as pleasure. If you're getting into an overload situation, you're at the helm - go do something else.
Incidentally, that wasn't an effort on my part to be hypercritical of you. It never ceases to amaze me that I wasn't the only one to analyze and overthink things - it seems universal.
If this is what it feels like, then I'd say this is not impossible. If it does not cause you any issues, I'd say you're good to go, just enjoy it and go with the flow.