Cueball and Brian have covered most of them. I can suggest a few (!) more songs containing words such as "dream" and "sleep", not sure how many of them have made it to karaoke, but they could do as filler music?
Lissie : In sleep
Shakedown : At night
Average White Band : She's a dream
Dream Weavers : It's almost tomorrow
Brand New Heavies : Dream come true
Michael Bublé : All I do is dream of you
Tina Turner & Barry White : In your wildest dreams
Damon Albarn : The marvelous dream
Classix Nouveaux : Is it a dream
Anastasia : Pieces of a dream
We The Kings & Demi Lovato : We'll be a dream (if you're a PHM subscriber you'll most likely have this but not know it
)
Billy Fury : Once upon a dream
Gabrielle : Tell me what you dream
Newton Faulkner : Dream catch me
Stevie wonder : Never had a dream come true
Marvin Gaye : Dream of a lifetime
[tenuous one here] Jason Donovan & Hank Marvin : Dreamboats and petticoats (from the musical of the same name - Sing To the World have the duet and solo vocals versions)
Nelly : Just a dream
James Taylor : Only a dream in Rio
Turin Brakes : Fishing for a dream
Mavericks : Dream river
Brand New Heavies : Dream on dreamer
Mayer Hawthorne : Dreaming
Mariah Carey : Dreamlover
John Martyn : Dreams by the sea
Gabrielle : Dreams
Fleetwood Mac / Stevie Nicks / Deep Dish : Dreams
Texas : Sleep
Reba McEntyre / Crystal Gayle : Talking in your sleep
Pretenders : I go to sleep
Petula Clark : Don't sleep in the subway
John Lennon : how do you sleep
[another tenuous suggestion] Vaughn Monroe : Sleepy lagoon
Beatles : I'm only sleeping
Tokens : Lion sleeps tonight
Apologies if I've repeated anyone elses suggestions