Knee pain at night is a common condition caused by injury, arthritis, bursitis, gout, and more. When it happens at bedtime, it can also lead to insomnia, which can leave you exhausted during the day.

Bursitis is a painful swelling of the bursae, the fluid-filled sacs that support the joints and reduce friction between tendons, muscles, and bones near the joints. Bursitis occurs when these sacs ...