Tramadol can make you sleepy, and this is one of its most common side effects, affecting 16% to 25% of patients in studies. Tramadol can also make you dizzy or lightheaded. Do not drive, operate heavy machinery, or participate in dangerous activities until you know how this drug affects you.
https://www.drugs.com/medical-answers/tramadol-make-you-sleepy-3554117/

