When your sister tells you that when when you were younger that you used to sleepwalk. Not just sleepwalk but traverse two flights of steps with the lights off (I was afraid of the dark ironically) and settle down in front of the aquarium, turn the light on and sit there and watch. She said I was unresponsive to noises and even her waving he hand in front of my face.
After a while I would walk back upstairs and go back to bed. Apparently this went on for some time.
Her telling me about the sleep walking and staring at fish explains a lot.
I also used to have recurrent dreams of visiting this place with silver water and orange skies (yea weird) and on the beach were dozens of fish tanks filled with all sorts of creatures. Every time I would come back I would see a different section with you name it. I actually looked forward to the recurrence. And then I grew up; i never went back.