Let me rephrase that.

I know that one HAS to dream, when one is asleep.

(1) But would it be possible to have supps that let you sleep deeper?

What does it mean to sleep "deeper," anyways?

(2) As we age, the ratio of REM to other part of sleep cycle changes. Is it possible to manipulate that ratio, through the use of supps?

Is your trying not to dream specifically, I think there was some evidence that 'remembering' the dreams requires a small pulse of NE. If your trying to sleep deeper I'm not sure. I would think the mode of action would have to work on the type of brainwaves. Aside from dinural beats I don't know of anything that does that but I've never looked either.

Actually, I believe the deeper you sleep, the more likely you are to have dreams. So the trick would be to sleep well enough to rest...but not fall in deep trance.

ALCAR + theanine

lots of antidepressants

zoloft can kill your feelings and dreams

Muscarinic compounds alter sleep architecture and there is a growing body of interesting literature on this topic, particularly WRT effects on memory recall and consolidation. The problem is that subtype-selective compounds are not widely available/published. Of course classic sedative agents such as H1-antagonists and GABAergics modulate sleep architecture as well, with the former's effects being more undesirable than the latter. Beyond this, newer non-narcotic sleep aids (eg ambien) that are all the rage lately can change sleep architecture. Supplemental Magnesium, L-theanine, and other supplements also have effects in this area.

-dreams occur more often in REM sleep - intense, visual, maybe action orientated and more likely to be emtional
-also occur during NREM - less visual and less bizarre - NREM dreams such as those at the beginning of sleep are more "thoughtlike"
-most people dream 4 times per night each lasting a few seconds to a few min - first dream typically occurs 90 min after falling asleep lasting 10 min
-Usually recall dreams because - you woke up, or had powerful imagery or emotion

Lefton, Lester A., Linda Brannon, Michael C. Boyes & Nancy A Ogden. Psychology. 2nd Canadian edition. Pearson 2003

From the same text I'm looking at figure 4.2 which shows changes in sleep patterns over a lifetime, there is really very little change in the amount of REM once you hit 10yrs a very slight increase from 20 (~15-25) but after that it looks like smooth sailing. Their is a noticeable linear decrease in total amount of sleep needed.

So with that in mind it comes down to not waking up, reducing imagery and emotion so you don't remember the dreams. I rarely remember my dreams, when I do it's usually during periods of time I have lots on my mind. So I'd say:

Something to reduce stress
Biofeedback - control your involuntary actions better ex how one can wake up every day 1-2 min before the alarm or an hr early if wanted
Something to reduce emotion or imagery during dreaming

Don't take melatonin as this makes me dream.