expression, godan verb (-su)
cry in bed; cry oneself to sleep; weep secretly in bed
Idiomatic expression for crying alone in bed, often implying hidden sorrow or nighttime tears. The literal image is moistening one's pillow with tears.
失恋して、毎晩枕を濡らした。
After the heartbreak, I cried myself to sleep every night.
彼
Unable to tell anyone, he spent days weeping secretly in bed alone.