Using himself as a Guinea Pig, and two dozen bottles of Star Port, Dipso stumbled upon a strange anomaly. While he established that drinking three bottles of Star Port in two hours cost him a whole magnitude in his night vision.
There were certain compensations though. A large number of brighter stars which were previously thought to be single stars, were reportedly clear, naked-eye double stars, and he has been able to report several suspected comets.
Following this, he has tested the theories of Dr. (Pappa Doc) Duvalier, of Port Au Prince Haiti, whose historical research had convinced him of the importance of head warming, for enhanced night vision.
Over the centuries, a broad spectrum of outdoors people, New Zealand Shepherds, Tibetan holy men, Ukrainian goat herders and Tasmanian milkmen have reported on this phenomenon. Black sheep and goats are apparently much easier to locate on dark, moonless nights if the head is warmed by the equivalent of 5mm of woven wool, while milkmen report it is much easier to distinguish bored house-wives from their husbands in unlit houses when wearing appropriate protection.
The scientific reason for this is not properly understood and more research is currently being undertaken, however, it is believed that an increased general blood flow, as well as sudden rushes of blood to the head may have something to do with the increases in night vision.