It's obviously a ghost. Any scientist with a degree in Ghostology and Spookyonomy will tell you that.
On closer observation I see things looking like a vent, two specks of light, and some fixture -perhaps a light switch. Possibly seen through an open door. Even then it's a nice job... It's got so many 'crappy camera' artifacts that it's either real or someone went through a lot of trouble to make it look so
Not sure. Can you provide another image for comparison, from same PoV, without the two sleeping guys?