It's not that you dream rarely, it's that you rarely remember your dreams. As a general rule, the only times we remember dreams is when we wake up right after

It's not that you dream rarely, it's that you rarely remember your dreams. As a general rule, the only times we remember dreams is when we wake up right after (or during) the dream without leaving REM state. For some people this always happens, for others rarely. But you can induce it setting an alarm for a time that you're likely to be in REM state. To find that time, some kind of sleep monitor is helpful. There are also some supplements and medications that have the effect that sleep is lighter in the later stages and it's therefor more likely to wake up during REM. One worth trying is 5-HTP, probably 200mg... this should make you sleep more deeply in early sleep and more lightly when it wears off after a few hours.