A break in continuity, a gap in reality.
A tinge of enlightenment, a fritter of time.
Falling into a daydream cognates plunging into an abyss. One does not know when it will end or what will result from it. It might give us accidental brilliant ideas, or might just turn out to be a mess in your head and a waste of precious time. The metaphors of sun and water add to the balance of wisdom and careless drifting that we experience when we daydream. While the mountains embody this endless, magnificient abyss that we too very often spiral into.