insomnia
"I took the 50 mg dose and within the first couple hours felt sick to my stomach.  During the night I felt like I was half asleep but never fully out.  I had a hard time getting up the next day.  I felt light headed and kept yawning constantly.  I felt like I was in a fog that didn't break until about noon.  Later in the day I had a headache.  I wouldn't recommend this particular drug."