Sleep paralysis
A documented neurological state in which the body remains paralysed while the mind wakes — strongly associated with hallucinated bedside presences.
Definition
Sleep paralysis is the carry-over of REM atonia (the body’s natural muscle-locking during dreaming) into wakefulness. The sleeper is conscious but unable to move. Episodes typically last from a few seconds to two minutes, occur most often as the sleeper transitions in or out of REM sleep, and resolve on their own.
In roughly 30% of episodes, the sleeper experiences a hallucinated presence — usually felt before it is seen, often described as crouched or hovering at the foot of the bed. This component is sometimes called intruder hallucinations. It is documented in every culture that has produced sleep research, under different names: the Old Hag in Newfoundland, the Mara in Scandinavia, the Pisadeira in Brazilian Portuguese folklore.
This recurring template — a pale, crouched figure at the foot of the bed — is the experience The Rake was, intentionally or not, written to fit. The figure is most likely not real. The experience reliably is.