Article: Some believe ghosts can affect the types of dreams you have. If you begin having intense nightmares, this can be a sign of a haunting. You may have nightmares about the supernatural and feel like something is chasing or attacking you in your sleep. Nightmares may be very vivid, to the point you can physically feel things in your dreams.  If you're experiencing things like shortness of breath during sleep, however, see a doctor. This can be a sign of a medical condition, such as sleep apnea, which should be ruled out before you attribute the issues to ghosts. Nightmares can also have psychological causes. If you've been stressed or upset lately, this may be causing your nightmares as well. Your own intuition can help guide you when evaluating whether your house is haunted. People who live in allegedly haunted homes sometimes feel like they're being watched. If you ever get a sense you're not alone, even if no one else is in the room, this can be a sign of a haunting.  If you have other people living with you, ask them if they experience the sense of being watched as well. Keep in mind, feelings of nervousness and paranoia can also be attributed to underlying mental health issues. This kind of anxiety should be evaluated by a mental health professional. Ghosts can allegedly affect personality and mood. If you or another household member becomes angry, irritable, or inexplicably sad, this may be a sign of a haunting. If negative moods tend to only surface in your home, this indicates there may be a ghost present. Low moods and irritability can be a sign of mental health issues, however. If you have a persistent low mood for a long time, see a therapist before attributing it to a haunting. Some people believe hauntings cause mild physical symptoms. For example, you may sometimes come down with small colds. Hauntings can also cause an overall feeling of weakness.  As these symptoms can be caused by a number of other ailments, however, see a doctor before attributing them to a haunting. If everyone in the house is experiencing physical symptoms, have your home investigated by professionals to check for hazards like mold and bacteria.

What is a summary?
Pay attention to your dreams. Notice if you feel you're being watched. Evaluate changes in your own or other people's moods. Watch for strange illnesses and feelings of weakness.