I've heard of all the ones you mentioned used on the skin for moisturizing particularly dry skin. That's the only thing I can come up as far as using the entire combination together. Although I've heard of the individual scents used in aroma therapy for various things (such as lavender to induce sleep.). Anything with lavender and patchouli is good in my book!

Patchouli and cedarwood aren't usually classified as edible-grade oils, so I think this would be for external use only. You could use it as a room freshener or for incense. Using a small amount for a heated oil massage should also be OK.

Stress reduction, sleep inducement and good dreams...I'd also like to smell like that. I think it would also work as an insect repellant, if worn.

Cedar and lavender are incense associated with Thoth, the Egyptian God of Magick and communication and cedar is sometimes used to ward off nightmares.

Seems/feels to me like a nocturnal scent for dreams.

Good job. Anti-anxiety and peaceful sleep were the main intents. I'll have to make the next mixture harder.

A nice massage oil is a good idea too, Aunt Coffee.