Verbseoul.
ㄹ stem
잠들다jamdeuldato go to sleep

To say to go to sleep politely in the present tense, use 잠들어요 (chahm-deu-ruh-yoh). Below is the full conjugation of 잠들다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
잠들어
chahm-deu-ruh
잠들어요
chahm-deu-ruh-yoh
잠듭니다
chahm-deum-nee-dah
Past
잠들었어
chahm-deu-ruh-ssuh
잠들었어요
chahm-deu-ruh-ssuh-yoh
잠들었습니다
chahm-deu-ruh-sseum-nee-dah
Future
잠들 거야
chahm-deul- -guh-yah
잠들 거예요
chahm-deul- -guh-yae-yoh
잠들 겁니다
chahm-deul- -guhm-nee-dah

Other useful forms

Command Polite (세요)
잠드세요
chahm-deu-sae-yoh
Suggestion / Let's Polite (요)
잠들어요
chahm-deu-ruh-yoh
Question Polite (요)
잠들어요?
chahm-deu-ruh-yoh-?
Connective “and” — (고)
잠들고
chahm-deul-goh
Conditional “if” — (면)
잠들면
chahm-deul-myuhn
Noun form — (기)
잠듦
chahm-deum