You can't actually "hear" your dreams in the same way you hear sounds in the real world. Instead, your brain is creating a sensory experience that feels like hearing. This phenomenon is called auditory imagery.
During sleep, your brain is still active and processing information, even though you're not fully conscious. Your brain can draw on memories and experiences to create vivid sensory experiences, including sounds, during your dreams.
Auditory imagery can be incredibly realistic. You might dream about hearing music, voices, or even specific sounds like running water or birds chirping.
The intensity and clarity of auditory imagery can vary from person to person. Some people experience it very vividly, while others might only have occasional or faint auditory experiences in their dreams.
It's important to note that auditory imagery is a normal part of dreaming. If you're experiencing particularly vivid or disturbing auditory imagery, it might be a sign of stress or anxiety, but it's usually nothing to worry about.