This phrase literally translates to 'He who sleeps with children wakes up wet.' It is a warning or advice that means if you involve yourself with people who are inexperienced or immature, you may face unnecessary complications or problems.
Examples
- Spanish: Si sigues trabajando con ese equipo de novatos, recuerda: el que duerme con niños amanece mojado.
- English: If you keep working with that team of rookies, remember: he who sleeps with children wakes up wet.