Abu Ubaid said in his book in the unusual words used in some Ahadeeth that some people passed by a tree that they ate and they were soon immobilized, just as if a wind had swept through by them and froze them.
The Prophet said:
The Prophet mentioned the water skins because they cool the water more than clay containers. He called the Iqamah an Azan in his Hadith. Some doctors stated that the remedy that the Prophet prescribed in the Hadith is one of the most effective against narcolepsy if it occurs in the area of Hijaz, which is a hot dry land. The inhabitants of that area have a weak instinctive heat.
Pouring cold water on the people afflicted with narcolepsy during the above-mentioned time, which is the coolest time of the night, will cause the instinctive heat that is scattered throughout the body to be energized and accumulate in the inner parts of the body where the ailment resides. The powers of the body will then concentrate on expelling and resisting the ailment by Allah’s will.