What is "sleepmarken"

Hag \Hag\ (h[a^]g), n. [OE. hagge, hegge, witch, hag, AS. h[ae]gtesse; akin to OHG. hagazussa, G. hexe, D. heks, Dan. hex, Sw. h["a]xa. The first part of the word is prob. the same as E. haw, hedge, and the orig. meaning was perh., wood woman, wild woman. [root]12.]

1. A witch, sorceress, or enchantress; also, a wizard. [Obs.] ``[Silenus] that old hag.''
   --Golding.

2. An ugly old woman.
   --Dryden.

3. A fury; a she-monster.
   --Crashaw.

4. (Zo["o]l.) An eel-like marine marsipobranch ( Myxine glutinosa), allied to the lamprey. It has a suctorial mouth, with labial appendages, and a single pair of gill openings. It is the type of the order Hyperotreta. Called also hagfish, borer, slime eel, sucker, and sleepmarken.

5. (Zo["o]l.) The hagdon or shearwater.

6. An appearance of light and fire on a horse's mane or a man's hair.
   --Blount.

   Hag moth (Zo["o]l.), a moth ( Phobetron pithecium), the larva of which has curious side appendages, and feeds on fruit trees.

   Hag's tooth (Naut.), an ugly irregularity in the pattern of matting or pointing.