That first glance in the mirror can say a lot about your night and your health. If your eyes are bloodshot red even before you’ve had coffee, it’s not just a skincare issue. Morning eye redness is often a sign that something’s off and that your body is signalling to something- whether it’s as simple as dry air in your bedroom or as serious as glaucoma.The catch? Red eyes are not a diagnosis. They may be a symptom, and one that can be indicative of many conditions. Getting the reason behind the redness is crucial to alleviating it and safeguarding your sight. Here's an examination of the seven most frequent causes — and why you should take them seriously.1. Sleep Apnea and CPAP Side EffectsObstructive sleep apnea not only interferes with your breathing — it may interfere with your eye health as well. Those who have this condition tend to sleep with their eyes half-open, drying them out. And for those who are on CPAP therapy, the constant flow of pressurized air can blow up into the eyelids, drying them further.Sleep apnea dry eyes are also more severe in the morning and may make the whites of your eyes appear red and inflamed. If you also snore loudly, are very tired all the time, or your bed partner has noticed that your breathing stops during sleep, speak with a doctor. Addressing the apnea and refitting the CPAP mask may alleviate both the eye and sleep symptoms.2. Dry Eye SyndromeIf your eyes aren't making enough tears — or the tears they do make aren't efficient — you might have dry eye syndrome. It can bring stinging, burning, redness, and blurred vision, particularly upon awakening.Sleeping with a ceiling fan, air conditioning, or heating vent blowing on your face will make it worse. Your sleeping position counts, too: side-sleepers sometimes keep one eye slightly ajar, allowing moisture to escape.Risk grows with age, contact lens wear, deficiency in vitamin A, and autoimmune conditions like lupus. Treatment extends from over-the-counter eye drops to prescription medicines that stimulate your eyes to produce more tears.3. Conjunctivitis (Pink Eye)Pink eye isn't something to worry about in early childhood. Adults may wake up with red, irritated eyes caused by viral, bacterial, or allergic conjunctivitis. If there's discharge, the eyelids may be crusty in the morning. Red eyes without discharge are more likely from bacteria. Viral pink eye tends to result in watery discharge and swelling of the eyes. Allergic conjunctivitis can cause lots of itching.Bacterial and viral types are contagious, so washing your hands, with new towels, and no eye makeup are a must. Although antihistamines work well for allergic conjunctivitis, bacterial infections can be treated with antibiotic drops. Viral pink eye generally heals by itself, but cold compresses can relieve pain.4. Allergies at Work OvernightSeasonal or environmental allergies may cause morning redness by inflaming the sensitive blood vessels in your eyes. Pollen, animal dander, dust mites, and mold spores will stick to your eyelashes and eyelids throughout the day. When you go to bed, these allergens are in direct contact with your eyes for several hours, causing morning irritation.The giveaway? Itching. When you wake up with eyes rubbing, allergens are often the offender. Pre-bedtime facial washes, allergen-proof bedclothes, and closed bedroom windows can help. In resistant situations, antihistamine eye drops are sometimes required.5. Ocular Rosacea (Eyelid Acne)Yes, acne can indeed get on your eyelids. Ocular rosacea — a long-term inflammatory disorder — can cause eyelids to appear red, puffy, and irritated. It usually occurs in combination with facial rosacea but can appear on its own.People in their 30s to 50s are most commonly affected. Triggers include sun exposure, spicy foods, and hot beverages. While there’s no cure, symptoms can be managed with warm compresses, eyelid scrubs, and prescribed topical or oral medications. Treating the underlying rosacea can reduce morning redness and irritation.6. GlaucomaThough uncommon, waking up with red eyes may indicate acute angle-closure glaucoma — a true emergency. It occurs when fluid accumulates quickly within the eye, causing intraocular pressure to shoot to perilous levels.In addition to redness, symptoms may involve intense pain in the eye, headache, blurred vision, nausea, and halos around lights. If left untreated immediately, this can result in permanent blindness in hours to days. If you ever find yourself with these symptoms, immediately seek ophthalmologic attention.7. Subconjunctival HemorrhageIf ever you've awoken with a bright red eye but have no pain, you've probably had a subconjunctival hemorrhage — a ruptured blood vessel just beneath the surface.It appears scary but is generally not a problem. It may occur from coughing, sneezing, rubbing your eyes during sleep, or even from routine blinking. The blood will usually be reabsorbed in one to two weeks without medical intervention. Nevertheless, if it occurs over and over, an eye physician can test for underlying conditions such as high blood pressure or clotting disorders.When Should You Go See A Doctor?Morning redness that happens occasionally and clears quickly may not be cause for concern. But if it becomes frequent, is accompanied by pain, discharge, blurred vision, or sensitivity to light, it’s worth getting checked.Your eyes have limited means of communicating distress, and redness is among them. Untreated, some causes — such as glaucoma or chronic dry eye — can cause permanent damage. A thorough eye exam will identify the issue and head off complications.Waking up with red eyes is no laughing matter. Whether it's the result of allergies, dryness, infection, or more severe eye disease, the sooner you know the cause, the sooner you can safeguard your vision. Simple tweaks, such as tweaking the sleep environment, keeping allergies at bay, or being compliant with chronic conditions, can pay dividends — both for your eye health and your morning routines.