Sleep and anxiety are closely connected, and each can strongly affect the other. When a person feels anxious, the mind stays alert, making it difficult to fall asleep or stay asleep through the night. Poor sleep then increases stress levels, weakens emotional control, and makes anxiety symptoms worse the next day. Lack of rest can lead to constant worry, irritability, and difficulty concentrating. Getting enough quality sleep helps calm the nervous system, improves mood, and reduces anxiety, making proper sleep an important part of mental well-being.