Make your book
A child, a grown up who works at night, and the grown up who does bedtime. A favorite stuffed animal is optional. Up to 6 people and pets in all.
The one being tucked in.
A nurse, a doctor, an aide: anyone in scrubs who takes care of patients all night.
The one at home that night.
Optional. Your child lends it for the night shift. With none, a little moon lamp goes instead.