The clue "Sleep phase initials" last appeared in the Newsday.com crossword on April 19, 2017. The correct answer for this puzzle is "REM", a 3-letter word.
Solution REM is 3 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is REM with 3 letters, and the shortest is REM with 3 letters.
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The solution is 3 letters long.