An irrational fear of eight-legged insects could be considered this type of fear
Arachnophobia
That nightmare felt so surreal! That may be in part to this chemical released in the brain, which typically causes us to feel pleasure throughout the day and serves as our primary reward system, but creates a strange quality during dreams
Dopamine

Can you figure out this kid's costume? No, he didn't take a fatal tumble in the whole grains aisle
Serial/Cereal Killer
Finish the lyrics from Michael Jackson's Thriller: "It's close to _________________ / And something evil's lurking in the dark"
Midnight
Scandinavian aquatic wildlife, or an especially tasty gummy
Sweetish (Swedish) Fish
Scared to stand too close to high ledges? If it feels like your world is spinning when standing on a precarious precipice, you may have this affliction
Vertigo
Your nightmares typically occur in this advanced stage of sleep, in which you body is doing this type of "rapid" movement
Rapid Eye Movement (REM)

If you can recognize the candy on her pants, you may be able to figure out this costume
Smartie/Smartypants
Finish the line from this song: "They did the Monster Mash (The Monster Mash) / It was a _______________ ____________"
Milky Way
Don't like hanging out in a crawlspace? Feel like the walls are caving in? You may have this fear of small, condensed spaces
Claustrophobia
This chemical is produced naturally in the pineal gland to regulate sleep, but additional supplements can be taken for those afflicted with insomnia. Be careful those, a high concentration of this chemical can sometimes trigger intense dreaming.
Melatonin

Can you figure out why the hidden idea behind this person's cheery costume?
Ceiling Fan
Identify the missing lines in this movie theme song: "If there's something ___________________ ___ _______ ____________________ / Who ya gonna call?"
Strange in your neighborhood (from Ghostbusters)
A term of endearment for batter with 714 home runs, or a bar with peanuts and caramel
Baby Ruth
If an animal feels threatened for its life, they may experience this type of triggered "response" — prompting them to either run from their fear or face it in head on confrontation
Fight or flight
Psychologist Sigmund Freud posed the theory that dreams are a fulfillment or exploration of repressed desires, activating this typically dormant part of our minds
Unconscious Mind

What is this man's joint costume with his child?
Dr. Pepper
From A Nightmare Before Christmas: "In this town, we call home / Everyone, hail ___ _____ _______________ _________"
A considerable sum of cash, or a bar featuring crispy rice
100 Grand
Afraid to swim too far from the shore? If so, you may suffer from this nautical fear of deep, vast bodies of ocean water
It's strange... that dream was so scary, but I've already forgotten what happened! Well, that may be in part because this part of the brain, associated with memory retention, is typically inactive during sleep
Prefrontal Cortex
This costume is actually a reference to a constitutional amendment, can you figure out which one?
Second Amendment (The right to bear/bare arms)
This song will have you and your French teacher asking What is that?: "Psycho Killer / _________ ________ __________"
Qu'est-ce que c'est?Qu'est-ce Que C'est? (From Psycho Killer by The Talking Heads)
A positive affirmation in Spanish, or a Kinder delight
Bueno