Right after my surgeries, I was taking 10mg Tizatidine (generic Zanaflex) twice a day. Yeah, I was whacked out, but I was also taking oxycontin 20mg twice a day. Somehow, I still managed to be awake a few times during the day.

Loads of naps.
Later I was switched to flexaril 10mg., I had taken this before and been completely knocked out for 12+hours, so I modified the doseage to 1/2 a tablet (5mg) at bedtime. None during the day. So far, it's working good - been a year tho and I feel the need to increase the dose back to 10mg - but only at night. I don't think I could function during the day like that.
No odd side effects like weight gain or depression!
Anne