We received this string, but I have no idea what it means! 3845281945283805284526053525260547380516453748164748478317454508
ARGH I CAN'T SLEEP PEOPLE KEEP STEALING MY ZZZZs . . . NO MORE ZZZs /cries
P.S. You're overthinking it.
P.P.S. Blocks of 2
Final hint: sqrt(ABCDEFGHIJKLMNOPQRSTUVWXY). Where'd my Z's go?