Celtic seers intentionally induced prophetic dreams about the future by sleeping wrapped in bloody bull hides
Want to know who is going to win the next battle? Just slaughter a bull, drink a bunch of its blood, wrap its warm, freshly flayed skin around your entire body, and take a nap. The sensory shock and mild suffocation led to horrific nightmares, which they casually interpreted as completely sound tactical advice.

This article describes beliefs and cultural traditions, which are not necessarily scientifically established facts.
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