Does the content of a dream have any meaning?
Can friends and family members who have passed on visit us in our sleep?
Is it possible for dreams to be precognitive, foreseeing future events?
Does lucid dreaming enable us to travel out-of-body?
There's really no way for us to know for certain whether visits from deceased individuals and precognitive or lucid dreaming actually occur. However, there is a difference between what we speculate might be possible and what science-based evidence tells us is likely probable. SciShow’s “The Science of Dreaming” explains what goes on inside of our minds and bodies while we sleep and why our dreams are so important to our waking lives.