The Sleeping ghost is a blue ghost appearing in RGB episode Take Two. It appears when its sleep is disturbed. It hates sounds of all kinds. It takes possesses the body of the megazoid. Causing it to change it's face appearance into a blue face creature with many mouths. It spends most of the episode chasing after the Ghostbuster and destroying anything that makes noise. It's rampage would have continued until Egon convinced it through Sign Language to stop come with them. Everything was going smoothly until the Loud Mouth Director come bursting in causing the ghost almost return to the megazoid. Until the Ghostbuster caught it off guard and then trap it.
It is possible that the Toy Ghost is classfied as a Sleeping Ghost. Due to the fact that sleeping ghosts spend eternily sleeping. Until they're disturbed.
Waking them up in a grumpy nasty mood.
The Sleeping ghost makes a cameo appearance in X-Mas Marks the Spot inside the Containment Unit