For the most comfortable reach, aim for your nightstand to sit level with the...

https://www.bookmark-tango.win/for-the-perfect-bedside-balance-aim-for-a-table-height-that-sits-5-10-cm-below

For the most comfortable reach, aim for your nightstand to sit level with the top of your mattress or just 5-10 cm lower. This makes grabbing a glass of water or your phone effortless while you are in bed