An article in The Telegraph relates this fascinating tidbit:
Research from 1915 through to the 1950s suggested that the vast majority of dreams are in black and white but the tide turned in the sixties, and later results suggested that up to 83 per cent of dreams contain some colour.
The article presents the results of research done by Eva Murzyn, a psychology student at Dundee University that attributes this change to whether we were exposed to color television as children or only to black & white. She notes, “What is even more interesting is that before the advent of black and white television all the evidence suggests we were dreaming in colour.”
Her research confirms the t.v. hypothesis. Her results showed
Only 4.4 per cent of the under-25s’ dreams were black and white. The over-55s who had had access to colour TV and film during their childhood also reported a very low proportion of just 7.3 per cent.
But the over-55s who had only had access to black-and-white media reported dreaming in black and white roughly a quarter of the time.