Symptoms of motor disorders include tremors, jerks, twitches, spasms, contractions, or gait problems. Hypnic jerks are one form of involuntary muscle twitches called myoclonus. Common side effects include dizziness, drowsiness, dry mouth, and twitches. These often included pacing, involuntary muscle twitches, and repetitive self-mutilation. Her left eye commonly twitches when she's nervous. In describing the yips, golfers have used terms such as "twitches", "staggers", "jitters" and "jerks". He always wears a peaked cap and twitches his left eye when lying. Katie begins to experience twitches in her finger, which prevents her from playing the guitar. Individual twitches can become indistinguishable, and tension rises smoothly eventually reaching a plateau. For example, low-dose clonazepam at bedtime may make the twitches disappear over time. To perform magic, Samantha often twitches her nose to create a spell. She eventually stops and walks off, just as Victor's hand twitches. This extends from simple limb twitches to more complex integrated movement. Courtship involves small, quick head twitches by the male, who exhibits brighter courtship colours. However, when Graham puts Joe in the boot of his car, Joe's hand twitches.