The word "sleyed" is spelled with the letter "e" after "l" due to the pronunciation of the word. IPA phonetic transcription for "sleyed" is /sleɪd/. The sound "ey" in the word represents a diphthong, which means two vowel sounds coming together to form a single sound. The "e" after "l" indicates that the "l" sound is not doubled or pronounced for a longer duration. The spelling of "sleyed" reflects the pronunciation of the word accurately.