For a comfortable reach, your nightstand should sit level with the top of your...

https://www.unitedbookmarkings.win/in-my-experience-the-golden-rule-is-to-keep-your-bedside-table-5-to-10-cm

For a comfortable reach, your nightstand should sit level with the top of your mattress or just 5–10 cm below it. Most UK beds work best with a table height between 55 and 70 cm. Measure from your floor to the top of your mattress before you buy