Too many coincidences here.

Nick Samdman becomes famous on MLK Day of ‘I have a dream’

PoTUS posts about them and mentions Dream

PoTUS spells Sandman then Sandmann in two separate tweets.

PoTUS then tweets #EnterSandman with pic of player 42 in HOF2019

I searched the hashtag and found 42 and 23 sign together! 23 is a famous Q number. The hashtag led to some fairly sinister looking tweeters. 32 and 11 were also involved