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

https://fionafreshmaids.com/the-ultimate-guide-choosing-the-perfect-bedside-table-height-for-a-65-cm-mattress/

For a comfortable bedroom, your nightstand should sit level with the top of your mattress or just 5-10 cm lower. This height makes reaching for your water or book effortless without straining your shoulder