For the most comfortable feel, aim for your nightstand to sit between 5 and 10...

https://www.cast-bookmarks.win/for-the-most-comfortable-feel-aim-for-your-nightstand-to-sit-between-5-and-10

For the most comfortable feel, aim for your nightstand to sit between 5 and 10 centimetres below the top of your mattress. Most standard bedside tables in the UK range from 55 to 70 centimetres tall