I think the Japanese have recently released a multi sense 'dream machine' that uses smell along with other ques.
I have only used smell sense a little.
Sometimes lavender oil for when I sleep, and I used it a bit last night durind a MILD prep/meditation/mantra session
I have always found it helps give me the odd vivid and emotional dream. Thats before I ever knew anythig about it's properties acording to aromatherapy, so I gues there has to be something in it that works.

I never actually thought of using a mask for the LEDs. I think I'd probably find it hard to sleep in but I may give it a try.
My bigest concern is the ticking of the clock
I am used to sleeping in a dead quiet room.