For a comfortable reach, your nightstand should sit level with the top of your...
https://www.mediafire.com/file/ci4j8luw7hfr284/pdf-67918-84454.pdf/file
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