Translation of the meanings Ayah 11 Surah Al-Kahf - English Translation - Abdullah Hasan Yaqoub - The Noble Qur'an Encyclopedia

Ayah: 11

فَضَرَبۡنَا عَلَىٰٓ ءَاذَانِهِمۡ فِي ٱلۡكَهۡفِ سِنِينَ عَدَدٗا

11. So We sealed up their ears⁹ (and caused them to fall into a deep sleep) in the cave for a number of years.

9. Their ears are specifically mentioned because the sense of hearing above and beyond any other sense is the one that spoils sleep most. If done in perfect circumstances, rarely is sleep disturbed by a cause other than noise.