For the most comfortable reach, your nightstand should sit level with your...

https://www.bookmarking-online.win/for-the-most-comfortable-reach-aim-for-your-bedside-table-to-sit-level-with

For the most comfortable reach, your nightstand should sit level with your mattress top or up to 10 cm below it. Most UK beds work best with a table height between 55 and 70 cm