For the most practical setup, aim for your nightstand to sit level with your...
https://spark-wiki.win/index.php/Two-Drawer_vs_Three-Drawer_Bedside_Table:_Which_Height_Works_Best%3F
For the most practical setup, aim for your nightstand to sit level with your mattress top or just 5-10 cm below it. This makes reaching for your phone or a glass of water effortless while you are in bed