Hallucinations, mirages and images can be caused by many very different things. Most involve either the brain tricking itself and making things up, or interpreting different physical phenomena as something else. ---- Seeing things that are not really there can be a sign of some serious physical disorders, withdrawal or side effects from medications, or chemical exposures with toxic effects, to name only a few examples. It is not something to ignore and should be checked by a medical professional for proper diagnosis and treatment without delay. Contrary to common belief, it is almost always caused by an underlying physical rather than a mental health problem.
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The most common reason can be that you are tired or have just woken up from a dream. If you are still worrying, see your health care consultant (doctor of psychologist).
People have 5 senses, taste, sight, smell, hearing and touch. The only way to not see or hear anything is to lose those senses. IT would be a challenge in life to lose those senses.