Flexeril completely knocks me out! Soma not so much. I strained my neck and my doctor gave me flexeril. I took 2 thinking that an extra dose would help the pain and I slept for 16 hours. So I've been taking a quarter at night when my neck hurts but it still leaves me with a hangover the next day. The strange thing is that my friend takes flexeril and doesn't feel a thing. One good thing I can say about it is that it totally cured my neck pain.