There are a variety of phrases and synonyms that can be used to describe when someone "sleeps in." Some common expressions might include "oversleeping," "lying in," "taking a lazy morning," or "snoozing past one's usual wake-up time." Other options might include "catching up on rest," "enjoying a lie-in," or "indulging a leisurely start to the day." Ultimately, the specific phrasing depends on the context and the speaker's intent. Whether one is describing a relaxing weekend or a habitual sleeping pattern, there are plenty of words and phrases to capture the idea of taking a little extra time in bed.