Just learn from Ven Shen Kai's audio how dreams works:
(so can clear some doubts)
Buddhism wants you to doubt. Big doubt = big realisation. Small
doubt = small realisation. No doubt = no realisation. 
Kinds of dreams:
1) se yin chan meng (form-based dreams) - what we see in color can
become dream. Example you see a base-ball tournament, then when you
come back you dream about it.
2) shou yin chan meng (feeling-based dreams) - you go to a place
and there's feelings, example when people insult you or praise you.
They can cause one to dream about it.
3) xiang yin chan meng (perception-based dreams) - think of it now
and daily, like thinking of fishing, then one day, you really will
go fishing.
4) xing yin chan meng (mental fabrication-based dreams) - example
when you come back from fishing, and you feel happy about it, then
when you dream, you'll still dream of fishing.
5) si yin chan meng (consciousness-based dreams) - 'si' or
consciousness is dualism. Thinking of how in the past people used
to fish and how people use to fish now, then when you see
documentary on fishing and you knew the know how. Our dualistic
views can cause dreams too.
6) sickness/4 elements imbalance based dreams - Another form of
dreaming is condition by the weather or in other word the 4
elements. Due to sickness, our 4 elements are in balance.
7) karma seed based dreams - Dreams that are due to the
accumulation of karma seeds be it good or bad, in our Alaya (Stored
Consciouness) through out our cycle of rebirths.
8 ) karma fruition based dreams - Dreams that are due to the coming
fruition of karma (future karmic events about to unfold)
9) emotional based dreams - Dreams that are due to family love,
friendship love, spouse love, etcs. The emotion of 2 party coming
together
10) divine intervention based dreams - Dreams that are cause by
intervention of Buddha, bodhisattvas or saints, for the sake of
delivering sentient beings.
note:
All the 5 aggregates can cause dreams. Another form of dreaming is
condition by the weather or in other word the 4 elements. Due to
sickness, our 4 elements are in balance. Example when dream of
flying, the wind element is in balanced. For people who always get
angry easily, they are bound to dream a lot. If one imagine of
flying, one can also dream of flying. Like for children who watch
Superman, at night they too can dream of flying. All are projection
from the 8th consciousness.
Amituofo!
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