Flexeril knocks me on my ass. I used to get them all the time from my doctor until he gave me tramadol. Up until yesterday, I hadn't take flexeril for like 6 months. I decided to take a break from tramadol so I took flexril last night and it knocked me out. It was just one little pill too. I took one at 8PM and didn't wake up until 2PM the next day. I now remember why I stopped taking it LOL.