Aries: Running away from something/being chased

Taurus: Being inaudible/no one hearing your screams

Gemini: Dying/already being dead

Cancer: Feeling or being lost

Leo: Teeth falling out

Virgo: Paranormal activity

Libra: Being paralyzed/Sleep paralysis

Scorpio: Becoming injured/sick

Sagittarius: Being unable to escape a room

Capricorn: Loved ones dying

Aquarius: Being late/missing an important event

Pisces: Car crash or drowning
I've actually had lots of nightmares of me in a car crash or me drowning, so I'm Not surprised.