Definition of 寝言は寝てから言え (ねごとはねてからいえ)
ねごとねい
                        寝言は寝てから言え
ねごとはねてからいえ
negotohanetekaraie
expression
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don't talk nonsense, sleep talk after you go to sleep(humerous)
Related Kanji
| 寝 | lie down, sleep, rest, bed, remain unsold | 
| 言 | say, word |