What loses its head in the morning but gets it back at night?

Why this works

This riddle plays on the double meanings of "head" and the different contexts of morning and night. In the morning, when you wake up, you typically lift your head off the pillow, causing the pillow to "lose" its head, as it no longer supports you. By night, when you go to bed again and lay your head back down, the pillow "gets its head back," as it resumes its role of supporting you while you sleep. It's a clever way to personify a pillow and highlight the routine of going to bed and waking up!