If there is no nightstand, you can use folded sheets.
Why do hotels not have a nightstand at each end of the bed when you need one? It can be particularly annoying when you need to use your phone or glasses in bed, but have no place to store them. You can use sheets to act as a substitute for a nightstand.
Wrap a piece of the bottom sheet around the edge of the bed. This section of the bottom sheet can be tucked under the mattress to create a pocket. If you want to avoid being without your favorite things while you sleep, this is a great hotel hack.