hi, i'm definitely no expert on this, but thought i would share my own experiences. My sleep has been disrupted a lot, but i have quite vivid dreams, which is strange as i never used to remeber my dreams at all. I even get a bit confused about things that have happened and things i have dreamt! But what you describe could be part of the depression JUST as much as my experiences could be. It seems to me that symptoms vary between people.
By the way, i hope you don't mind me saying but i think it is great you are doing what you can to support your boyfriend, and it will be of great help to him.
James.