I have to sleepAn informal shortened form of 寝ないといけない or 寝ないとだめ. It can also literally mean “if I don’t sleep,” especially when followed by another clause.
If you don’t go to sleep... if you don’t go to sleep, Hattie will come...
— तुम्बाड (2018)
phraseRare#20,192
if I/you don't sleepA shortened conditional expression meaning “if I/you don't sleep.” In informal speech, it can also mean “I need to sleep,” as an abbreviation of 寝ないといけない.
JA: もう寝ないと、明日起きられない。
EN: I need to go to sleep, or I won't be able to get up tomorrow.