For the best reach from your bed, aim for your nightstand to sit roughly 5-10...

https://www.bookmark-help.win/ideally-your-bedside-table-should-sit-5-10-cm-below-your-mattress-top-this

For the best reach from your bed, aim for your nightstand to sit roughly 5-10 cm below the top of your mattress. This makes grabbing a glass of water or your phone feel natural rather than a chore