P8. to make up a bed: to prepare sleeping accommodation not previously available.
ΘΚΠ
the world > action or operation > undertaking > preparation > prepare [verb (transitive)] > prepare or put in order > specifically a bed > where not previously available
to make up a bed1878
1878 M. A. BarkerBedr. & Boudoir iii. 42 This could be removed at night, and the bed made up in the usual way.