Hypnophage

This post brought to you by two weeks of insomnia.

Hypnophage (base):
Feeding form: an indistinct, human-shaped figure with waxy, opalescent skin.
Resting form: a hard,opalescent plaque-like film with a waxy finish

AC (base +/- HD) HD (varies, starts at 1) Att pseudopod
THACO & saves: as fighter

The Hypnophage does not want your gold, your flesh, your blood, or your soul.
It feeds on your sleep. Or rather, it feeds on your capacity to sleep in the future.
It attacks and feeds using pseudopods which emerge from it's chest and stomach.

Combat:

• On a successful attack roll the Hypnophage grapples and immobilizes the target. 
• The target can attempt to escape on it's turn on successful save vs paralysis.
• If the target is still immobilized on the Hypnophage's next turn, it feeds.
• Feeding: The Hypnophage deals 1d8 sleep damage to the target and gains the same amount in temporary hit points. 
• Once the Hypnophage's temporary hit points equal it's actual hit points it's hunger is sated.
• Once sated the Hypnophage will flee to rest and digest it's meal.

When it finds a safe location, the Hypnophage goes into a dormant state. It's humanoid shape melts and it coats the chosen substrate with a hard, plaque-like substance. The Hypnophage digests 1 temporary hit point per day. Once the Hypnophage has digested all the temporary hit points in it's reserves, it gains a Hit Dice and re-forms into it's feeding form.

Sleep damage:
Sleep damage reduces the character's next rest by 1 hour per sleep damage.
A character who takes 1 sleep damage only gets 7 hours sleep from an 8 hours rest, and so forth.
This damage stacks, and can carry over for multiple days--a character who takes 32 sleep damage cannot sleep for four days, etc.

Spellcasters who do not meet their rest requirements cannot prepare spells as normal.
All characters do not heal as normally, hit points, ability damage, etc. do not start to recover until the sleep damage has been repaired.

If the character attempts to prematurely correct the situation with a sleeping potion or draught they must Save v Poison. On a successful save, the sleeping potion does not work. The Sleep spell only

Hunger:
If there are Hypnophages in a dungeon, roll 1d12 and record the score for each Hypnophage.
This roll represents how hungry, and thus how desperate the Hypnophage will be as it fights.
Before and during combat, roll Morale as usual. If at any point the Morale check exceeds the initial Morale score, the Hypnophage's sense of self-preservation outweighs it's Hunger and it will flee.