Clue: Sleep cycle letters

Answer: REM

Length: 3

---

Similar Clues:

• Sleep-stage letters (REM with 3 letters)
• Sleep letters (REM with 3 letters)
• Sleep cycle, for short (REM with 3 letters)
• Part of a sleep cycle (REM with 3 letters)
• Sleep cycles (REMS with 4 letters)
• Sleep cycle (REM with 3 letters)
• Sleep cycle phenomena (REMS with 4 letters)
• Sleep lab letters (REM with 3 letters)
• Sleep cycle occurrences (REMS with 4 letters)
• Letters symbolizing sleep (ZEES with 4 letters)