Since the launch of Early Access this past April, Media Molecule has not been forthcoming about the number of Dreams users. While concrete data remains a secret, new information from the game itself confirms a ball park amount of current players. At the very least, upwards of 100,000 players have participated in Dreams Early Access.
This intriguing bit of information comes courtesy of a recent post on Reddit. Redditor Tmfwang shared a screenshot from Dreams, in which one account from the game, MmDreamQueen, was shown to have 100,000 followers. See the screenshot in the image featured below:

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