The golden rule for bedside tables is comfort. Aim for your table to sit about...
https://www.bookmarkingtraffic.win/for-the-most-practical-setup-aim-to-have-your-bedside-table-sit-5-to-10-cm
The golden rule for bedside tables is comfort. Aim for your table to sit about 5-10 cm below the top of your mattress. This makes reaching for your phone or a glass of water effortless while you are in bed