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

https://blogfreely.net/rothesqlmw/how-to-choose-the-perfect-nightstand-height-for-reading-in-bed

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