IamianaimaI

Transition to and from sleep may be attended by a wide variety of sensory experiences. These can occur in any modality, individually or combined, and range from the vague and barely perceptible to vivid hallucinations. People who have spent a long time at some repetitive activity, in particular one that is new to them, may find that it dominates their imagery as they grow drowsy, a tendency dubbed the Tetris effect. This can also occur to people who have travelled on a small boat in rough seas, or swum in waves. People may imagine their own name called or a doorbell ringing. Snatches of imagined speech are common. While typically nonsensical and fragmented, these speech events can occasionally strike the individual as apt comments on – or summations of – their thoughts at the time. They often contain word play, neologisms and made-up names. Speech may manifest as the subject’s own ‘inner voice’, or as the voices of others: familiar people or strangers. More rarely, poetry or music is heard. Humming, roaring, hissing, rushing and buzzing noises are frequent. Typical examples include a feeling of being crushed or suffocated, electric ‘tingles’ or ‘vibrations’, the imagined presence of a visible or invisible entity, and sometimes intense emotion: fear or euphoria and orgasmic feelings, alien abduction experiences and shadow people hauntings.