Final answer:
Restlessness is a side-effect characterized by an inability to sit still, often associated with conditions like insomnia, stress, or medication side effects. It can lead to concentration difficulties and feelings of anxiety, forming a cycle that exacerbates sleep issues. Severe consequences include depression, cardiovascular issues, and cognitive impairments.
Step-by-step explanation:
A side-effect where the person feels constantly restless and cannot sit still is best described as restlessness. This can be a symptom associated with various conditions such as insomnia, high levels of stress, or as a side effect from certain medications.
Restlessness can significantly impact one's life, making it difficult to concentrate and leading to feelings of guilt about neglecting obligations. This symptom can be part of a broader set of side-effects including agitation, anxiety, sleep problems, and muscular issues, all of which compound the individual's discomfort and challenge their ability to function normally.
It is important to note that prolonged periods of sleep deprivation or chronic insomnia can lead to restlessness, and potentially, increase the risk of anxiety about the inability to sleep. This increased anxiety can exacerbate the problem, leading to a cycle of increased arousal and further sleep disruption. The consequences of restlessness and sleep deprivation can be quite severe, leading to symptoms of depression, weight changes, cardiovascular problems, and cognitive impairments.