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Hypnagogic hallucinations are often auditory or have an auditory component. Like the visuals, hypnagogic sounds vary in intensity from faint impressions to loud noises, like knocking and crashes and bangs (exploding head syndrome). People may imagine their own name called, crumpling bags, white noise, or a doorbell ringing.
Auditory hallucinations have been known to manifest as a result of intense stress, sleep deprivation, and drug use. [14] Auditory hallucinations can also occur in mentally healthy individuals during the altered state of consciousness while falling asleep (hypnagogic hallucinations) and waking up (hypnopompic hallucinations). [27]
However, certain factors can trigger hallucinations, these factors include, old age, social isolation and even gender. [15] Many cases highlight female patients who have the disease. Overall, psychiatric disorders and neurological disease lead to hallucinations, but certain factors, such as age and gender play a role in heightening the causation.
Individuals with exploding head syndrome hear or experience loud imagined noises as they are falling asleep or are waking up, have a strong, often frightened emotional reaction to the sound, and do not report significant pain; around 10% of people also experience visual disturbances like perceiving visual static, lightning, or flashes of light.
Musical hallucinations (MH) can be described as perceptions of musical sounds in the absence of external auditory stimuli. Although imagined sounds can be non-musical; such as bells, whistles and sirens, case studies indicate that music "[takes] precedence over all other auditory hallucinations" (Sacks, 2006).
Musical ear syndrome (MES) is a condition seen in people who have hearing loss and subsequently develop auditory hallucinations. "MES" has also been associated with musical hallucinations, which is a complex form of auditory hallucinations where an individual may experience music or sounds that are heard without an external source. [1]
Though you can have dreams during NREM sleep, it’s likelier for more interesting and in-depth dreams to occur during REM sleep. There are a few key things that happen to your body during this phase.
However, that does not prevent people from being fooled by auditory illusions. Sounds that are found in words are called embedded sounds, and these sounds are the cause of some auditory illusions. A person's perception of a word can be influenced by the way they see the speaker's mouth move, even if the sound they hear is unchanged. [10]