Sleep Lab · Eye & light · 5 min read
Dry eyes at bedtime: screens, heat, and what actually helps
Three things sit in a bedroom at ten in the evening and none of them are in your eyes: a screen held at the same short distance for two hours, air that the heating has been pulling water out of since the afternoon, and a fan or a vent moving across your face. Changing them is unglamorous, and it is also the only part you control.
What three things are in the room at ten in the evening?
The screen. What matters most is not what the screen is made of, it is the distance. A phone held a hand's width from your face keeps your eyes at the same near point for as long as you keep reading, and the room behind it goes dark. The useful question is not which screen: it is how far away it sits, and whether anything else in the room is still lit.
The air. Heating does not add anything to a room, it takes water out of it. By ten in the evening the air in a heated flat can be noticeably drier than the air outside, and you can watch that on a cheap hygrometer rather than take our word for it. A room can be at a comfortable temperature and still be a thirsty room.
The movement. A fan left on, a vent above the bed, an air conditioner pointed at the pillow. Moving air is pleasant on a warm night, and it is also the thing most likely to be aimed at your face all night without anyone ever deciding that it should be.
What actually helps, in order?
- Move it further away before you dim it. Distance is the variable you can change tonight without buying anything. A screen at arm's length, held lower than eye level, with one lamp still on behind it, is a different object from the same screen at a hand's width in a dark room.
- Close your eyes on purpose, twice in the evening. Not as an exercise and not for a set number of seconds. Two minutes with your eyes shut while something else happens — the kettle, the last of a record, the dog — is a break in a two-hour hold, and it costs nothing.
- Put water back in the air, or stop taking it out. A humidifier, a bowl of water on the radiator, laundry drying on a rack in the same room: three prices for the same effect. Whatever you use, clean it, and keep the room moderate rather than tropical.
- Point the moving air somewhere else. A fan aimed at the wall, an air-conditioning louvre turned upward, a deflector on the vent. You keep the air movement in the room and your face stops being the target.
- Give it a week before you buy anything. One night tells you nothing, and the first thing most people buy is whatever was advertised hardest. Change the room, then judge it over a week of mornings.
What can a product not do?
There is a whole shelf of things sold for this — compresses, sprays, masks with a warm pad inside — and we are not going to recommend any of them, because the useful distinction is between changing a room and doing something to your eyes. The first is a bedroom habit. The second belongs to someone qualified to judge it, and the pages that sell it are not those pages. If you sleep in a mask, the one thing worth checking is where it touches: a mask that rests on your eyelids is a mask you will feel by morning.
What are we not going to claim?
We are not going to tell you that a lamp, a humidifier or a pillow will change how your eyes feel, because we have not measured that and could not show you a measurement if we had. What we can say is narrower and checkable: a screen further away, water back in the air, and no fan on your face is a different room from the one most people go to bed in.
There are no quotes on this page. The English pages on this subject were selling compresses, humidifiers, devices or supplements, and not one of them pointed to a source we could check. We would rather owe you a blank than borrow a sentence we cannot stand behind.
If your eyes are like this most mornings, or the feeling arrives with pain or a change in your vision, that is a question for a doctor rather than a page about bedrooms.
About AERÉ
AERÉ is a sleep and everyday-wellness home brand based in Hangzhou, China, designing twenty things for the hour before bed.
Questions people ask next
Probably not on its own, and we would not sell it that way. It changes one of the three things in the room. Measure before and after rather than guessing, keep the level moderate, and clean the tank — a humidifier left dirty is a worse room than a dry one.
We are not going to answer that as a yes or a no, because anything held against a closed eye is closer to something you do to your eyes than to something you do to a room. That is a conversation for someone qualified. We sell bedding.
No. The two changes that matter are distance and whether anything else in the room is lit. Reading on a phone at arm's length with a lamp on is a different room from reading the same phone at a hand's width with the overhead off. If you would rather not read at all, that is a choice about your evening, not a rule about screens.