What does it mean to hear a horn blow in your sleep?

Hearing a horn blow in your sleep could be a manifestation of your subconscious mind processing sounds from your environment or an auditory hallucination linked to your dreams. It might symbolize a call to attention or a warning about something in your waking life. Alternatively, it could simply be a product of your brain interpreting random noises while you sleep. If it happens frequently and disturbs your rest, it may be worth exploring potential sleep issues or stress factors.