Monsters are the primary antagonists of Among the Sleep and its prologue DLC. The original game features three monsters, while the DLC features two; these sets are exclusive.

The monsters' appearances are filtered through the imagination of The Toddler. As such, their appearances are relatively abstract and yet also quite simple.

Upon detecting a monster's presence, The Toddler will panic, manifesting as distorted vision and disturbing audio. If they make contact, The Toddler suffers a Game Over and must continue from an earlier portion of the stage. However, monsters are capable of sneaking up quietly behind the Toddler without triggering any of these cues, so he should always be aware in all directions.

Original game Edit

The original game contains three monsters. All three of them represent The Mother, who is an alcoholic, at different stages of her drinking.

The Stranger (Harald) Edit

The stranger resembles a silhouette tall figure wearing a coat & boots, it also holds a parasol. It represents The Mother donning a trench coat and leaving the house at night to purchase wine.

It shortly appeared as a shadow in the corner of the living room right before a lightning bolt struck. Because of her temporary absence, no monster attacks the boy early in the game. However, a jump scare of the Stranger occurs as a scripted event within the house and it might be able to catch it in The Playground.

The Forest Lady (Hyda) Edit

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The Forest Lady appears in the second level, The Forest, it represents The Mother when she's drinking and in sorrow, it's the only monster that is able to walk on water and emerges from the library, you can hear it close by cricket like sounds.

She is first seen when adventuring through the western side of the area within the fireplace room, where her head is bobs in the water after the fire is extinguished. She cannot harm the player here, and only kills the player if they fall in the water.

Later, when venturing the eastern area of the map, she appears through the window at the well, distorting the player's vision and leaving the screen. When the player fishes out the puzzle piece, she stalks them through the woods, where they must hide to evade her.   

When the player collects the key in the outdoor storage, she passes by outside, and the player must run and hide to reach and unlock the fence. Once the fence is unlocked, she appears behind them, but will disappear before doing any real harm.   

She appears one last time in the southern area of the house, the library. She appears straight ahead in the river, and the player must find a route past her or hide underneath cover to get through. On each edge of the river, the player must cross planks to reach the other side, where she will likely reappear. Find cover to evade her. Once you reach the final door to the bedroom, thew player must hind one last time under the chair or the bed to avoid her.   

When the player visits the playground for the third time, Teddy will comment on how disturbing and unusual the creature is, and state that she feels sorrow and sadness.  

The Coat Monster (Heap) Edit

The Coat Monster appears in the third level, The Closet, and represents The Mother while in anger, as indicated by its hatred of loud sounds and the child making a mess.

This monster is unique among the other monsters, as it not only can teleport like the other monsters, but spawn and chase the player when a bottle smashes, and even outrun and cut off the player when they run away. When spotted, the player must find a hiding space by opening a door and waiting for the monster to leave.

The monster first appears as a brief image in the corridor after crossing the bridge, serving only as a harmless jumpscare. Soon after, the player will come across a transforming painting identical to those in the previous chapter, only this time it cannot be passed through, and merely serves as a hint as to where the next key is, showing the star key bottle being snatched away by the monster and the location it moved it to.

The monster then begins stalking the player around the level, making harmless scripted appearances as they search for the key. The first is when the monsters escapes through a hatch, likely taking the bottle, the second is when it passes by across the broken planks after the player smashes a bottle containing the moon key, the third is when it passes ahead after freeing the the bridge the second time, the fourth is when it shrieks in rage after the star bottle is broken in the kitchen, (The monster will try to reach the player player through a hatch a bit earlier in the Enhanced Edition) and the final time is when it appears behind a pile of junk after an unavoidable bottle is smashed. From then on, the monster will pose a real threat to the player.

After crawling under another junk pile, the player will come across a tall wall of broken planks, which acts as the spawn point for the monster if a bottle breaks. The player will then traverse through a U-shaped hallway, which contains set-ups of bottles that will alert it when smashed. When the player gets through it and hides as it appears, they will reach the end and return to the star door to unlock the final memory.

In the final sequence of the level, just as the toddler is about to escape with the final memory into the exit tube, it grabs him by the leg and seizes Teddy, causing his arm to be torn off and the toddler to fall down the pit as it leaves with Teddy.

During the big reveal scene with the floodlights, the monster appears one last time as a vision, emerging from the darkness before the light flashes off.

It is implied in the introductory sequence that he frequently hides in the closet from the Mother, and it is shown after completing the Closet level, that it indeed takes place hiding in the actual closet. This may cause her attempts to seize him to appear like the various coats in the closet are attacking him, explaining why this monster resembles a trench coat and why all such coats among the house appear so imposing.

Prologue DLC Edit

The prologue DLC takes place in an unknown amount of time before the main game and features two monsters unique to itself.

The Shadow Edit

While wandering the house, the Toddler must evade a shadowy silhouette vaguely similar to The Stranger. Its precise behavior and symbolism are unknown; however, it likely represents The Father in some way as he is the only one in the house and is known from the DLC to be aggressive.

The Furnace (Hons) Edit

In the basement of the house is a large, retro-style furnace. Upon moving far enough into a dark spot in front of the Furnace, it will suddenly come alive, roaring and blazing, and chase after the boy with clumsy hops. If he then moves out of its activation zone and looks away, it will instantly return to its original space and wait to be awakened again.

In front of it are two light switches that can only be reached by climbing the nearby boxes. When he is within the light toggled by these switches, the Furnace returns to dormancy.

The Furnace can also be run straight past if he is quick enough. The reason for this is probably about how scary machines can be to other toddlers.