Hi, I was wondering if people have ever had trouble staying awake. i've been sleeping, taking vit D, magnesium, and today in a meeting I couldn't fight it and fell asleep. I was mortified. And some guy had to point it out. Which led to my boss calling me in. She knows I'm dealing with health issues. She was nice but she asked me to pay attention. That she was "concerned" about it. Its probably the second time. My only medication change was off zanaflex to cyclobenzaprine which I take about 2 hours before bed. I wonder how long it stays in your system. :??