Myoclonus is a sudden and involuntary muscle spasm. It is usually a symptom of an underlying disorder and can interfere with eating, talking, and walking. The movement is involuntary and can’t be ...

Sleep myoclonus is involuntary, nonrhythmic muscle twitching that occurs either as a person falls asleep or during sleep. The movements include hiccups, starts, and jerks. Sleep myoclonus is not a ...

Dementia is a syndrome of ongoing brain decline, beyond what can be expected as a result of old age. The condition is often recognised when signs of pronounced memory loss emerge. There are, however, ...