back.

These dream spirits are rather troublesome possessions while their
human habitations sleep they can leave them and wander at will. The
things seen in dreams are supposed to be what the Doowees see while
away from the sleeping bodies. This wandering of the Doowees is a great
chance for their enemies: capture the Doowee and the body sickens;
knock the Doowee about before it returns and the body wakes up tired
and languid. Should the Doowee not return at all, the person from whom
it wandered dies. When you wake up unaccountably tired in the morning,
be sure your Doowee has been 'on the spree,' having a free fight or
something of that sort. And though your Doowee may give you at times
lovely visions of passing paradises, on the whole you would be better
without him.

There is on the Queensland border country a dillee bag full of
unclaimed Doowees. The wirreenun who has charge of this is one of the
most feared of wirreenuns; he is a great magician, who, with his
wonder-working glassy stones, can conjure up visions of the old fleshly
habitations of the captured Doowees.

He has Gubberahs, or clever stones, in which are the active spirits of
evil-working devils, as well as others to work good. Should a Doowee
once get into this wirreenun's bag, which has the power of
self-movement, there is not a great chance of getting it back, though
it is sometimes said to be done by a rival combination of magic. The
worst of it is that ordinary people have no power over their Doowees;
all they can do is to guard against their escaping by trying to keep
their mouths shut while asleep.