For a comfortable bedroom, your nightstand should sit level with the top of...

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

For a comfortable bedroom, your nightstand should sit level with the top of your mattress or up to 10cm lower. Reaching for a glass of water is much easier when you aren't straining upwards