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

https://www.bookmarking-presto.win/for-the-best-look-and-easy-access-your-bedside-table-should-sit-5-10-cm-below

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 the top of your mattress