For a comfortable bedroom, your nightstand should sit between 55 and 70...

https://angelojvrt605.wpsuo.com/should-my-bedside-table-be-higher-than-my-bed-the-ultimate-guide-to-perfect-nightstand-height

For a comfortable bedroom, your nightstand should sit between 55 and 70 centimetres high. The golden rule is to keep the tabletop about 5 to 10 centimetres below your mattress surface