“`html Red Eyes Upon Waking Up Waking up with red eyes can be a result of various factors, including allergic reactions, conjunctivitis, and keratitis. Here’s a breakdown of each condition and how to manage them. Allergic Reactions Allergic reactions can cause blood vessels in the eyes to expand, leading to redness. Exposure to allergens such as pollen or pet dander can trigger an abnormal immune response, resulting in red eyes. To mitigate this, individuals can avoid known allergens, wear sunglasses, or use antihistamine eye drops like emedastine difumarate ophthalmic solution. Conjunctivitis Conjunctivitis, or pink eye, is an inflammation of the... Learn more