Soma's are king of the mountain for potency and effectiveness but do leave you detached sedated sleepy feeling, though effects are subjective, the flexeril are effect but man can they floor you, have sleepy haze real bad the next day for a lot of people, I included. the Robinax is claimed to be least sedating I was told when had an Rx for them, I shit you not though at 1000mg dose before bed and even tapered to 500mg I still had the amnesia feeling, literally would consciously forget shit bad... i could start driving to store and half way on trip there literally forget where or why I was even driving, I can effectively get by with half tab or 250mg dose if need be, def doesnt leave feelng super sleepy tired or me feeling stoned but absentminded, you betcha lol