Instruct: Classify Amazon reviews into positive or negative sentiment
Query: no-sleep

the very first day i used this product i took the recommended dosage in the morning before my work out. later that afternoon i felt real good--an energy rush--and i started working on my kata moves--punchin and kickin and whatever--a real burst of energy and positive emotion. however, i did not sleep that night. i continued to take this stuff for about two weeks--but i felt real odd, and i did not sleep well at all--little to none. eventually i discontinued it--and my sleep slowly recovered. i would not recomend it.