The article didn't exactly answer why you can't remember dreams. It's because a part of your brain (hippocampus) responsible for storing short-term memory into long-term memory is mostly turned off while you're sleeping. You only get to remember your dreams if you wake up before memories fade away from short-term memory.

Didn't it occur to researchers that irritability and other such inconvenient symptoms *might* result from the subject being woken in the middle of the night, rather than from them being deprived of dreams per se?...

Re. perfumes - Were there any studies on the effect of the wife farting in bed ??? Side-effects ???