The skin around the eyes is among the thinnest on the body and sits over loose tissue that holds fluid easily. Lying flat for seven or eight hours lets fluid gather there. Once you are upright and moving, gravity and circulation carry it away, which is why puffiness that looks dramatic at seven in the morning has often faded by midday.
The usual overnight contributors
A salty evening meal makes the body hold on to more water, and some of it collects around the eyes. Alcohol does the same while also disturbing sleep. Crying before bed, sleeping face down, or a late night with too little sleep all add to it. Hay fever and dust or pet allergies cause puffiness with itching and watering.
Some people notice that puffiness is worse after long flights, during hot weather or at certain points in the menstrual cycle, all times when the body tends to hold more fluid. Looking for a pattern over a couple of weeks usually points to the main cause.
Why it becomes more noticeable with age
The thin membrane that holds the fat pads around the eyes in place weakens over time, and the fat can bulge forwards, creating bags that are present all day. These are structural rather than fluid and do not settle by lunchtime. They are harmless, though many people find them frustrating.
Family traits play a part too. Some people inherit a tendency to under-eye bags that appears in their 30s, while others reach old age with little change. Sun damage over the years thins the skin further and makes structural bags easier to see.
Simple things that help
Raising the head of the bed slightly or using an extra pillow reduces overnight pooling. Keeping salt and alcohol lower in the evening helps many people. A cool, damp cloth held over closed eyes for a few minutes in the morning narrows small vessels and reduces swelling. Treating allergies and washing pillowcases regularly helps when allergy is the cause.
Chilled spoons or a cold gel mask work in the same way as a cool cloth. Gentle tapping with the fingertips under the eye, moving outwards, may help move fluid along. Rubbing hard or pulling the skin does not help and can irritate it.
Sleep and screens
Too little sleep makes puffiness and dark circles more obvious, partly through fluid changes and partly because tired skin looks duller. Rubbing tired eyes after long screen sessions irritates the delicate skin further. Regular sleep times tend to do more for the morning face than any cream.
Contact lens wearers sometimes find that leaving lenses in too long, or sleeping in them, makes the eyelids look swollen and red. Giving the eyes regular breaks from lenses is worthwhile, and any redness or pain with lens wear should be checked promptly.
When puffiness points elsewhere
Swelling that is present all day, affects both eyes and comes with swollen ankles or a sudden gain in weight can occasionally reflect the kidneys, the heart or an underactive thyroid. Thyroid eye disease can cause puffy eyes along with a staring or bulging look, grittiness and double vision.
When to see a doctor
Book an appointment if puffiness is new and persistent, is present all day, or comes with swelling elsewhere in the body, frothy urine or breathlessness. Seek prompt care for swelling around one eye with redness, warmth, pain, fever or difficulty moving the eye, and for any sudden change in vision. Ordinary morning puffiness that eases as the day goes on needs no more than a better pillow and a lighter evening meal.