See spirits

Seeing spirits is :
In the 2013 science-fiction thriller Gravity, Sandra Bullock plays an astronaut who gets stranded in a capsule in space following a catastrophe in which she is the apparent lone survivor. Cold, frightened, and alone, she resigns herself to her fate and shuts down the cabin's oxygen supply to commit suicide. 

As she begins to lose consciousness, she is visited (or is she?) by her fellow astronaut, played by George Clooney, whom she believed to be dead. He gives her a pep talk and a survival plan—and then he leaves. She eventually realizes that Clooney’s visit did not really happen, but the experience still gives her the strength to continue on. By following "his" plan, she is able to survive what seemed to be a hopeless situation.

The "Sensed Presence"

The sensed presence usually happens to individuals who have become isolated in an extreme or unusual environment, often when high levels of stress are involved. These individuals report a perception or feeling that another person is there to help them cope with a hazardous situation. The vividness of the presence can range from a vague feeling of being watched to a clearly perceived, seemingly flesh-and-blood entity such as Clooney’s character in Gravity. This entity might be a god, a spirit, an ancestor, or someone personally known to the observer. Sensed presences usually appear in environments with little variation in physical and social stimulation; low temperature is also a common ingredient.