Thyroid eye disease (TED) is a complex autoimmune condition affecting the tissues around the eyes and is commonly associated with other thyroid conditions such as Graves’ disease (1). It is characterized by inflammation, pain, swelling or protruding eyeballs (proptosis), eyelid retraction or inability to close the eyes completely, eye surface dryness, double vision (diplopia), and in severe cases, compression of the optic nerve (2). For people living with TED, even small daily habits can have a noticeable impact on comfort, inflammation, and the way the eyes look and feel. A commonly overlooked factor, but highly influential in determining TED quality of life (QoL) is sleep position (3).
Because TED involves inflammation, fluid shifts, and pressure changes within the orbit (the eye sockets), how you sleep affects how severe your symptoms may be when you wake up (1).
Understanding why sleep position matters helps patients get better control over common thyroid eye disease symptoms like puffiness, pressure, eyelid swelling, and morning discomfort. Research reinforces how nighttime conditions influence orbital congestion and the progression of TED-related inflammation (4). Below, we explore why sleep posture is so important, how nighttime swelling can develop, and what patients can do to reduce morning symptoms.
Why TED Symptoms Worsen Overnight
Many people with TED notice that their eyes feel worse in the morning and are visibly more swollen, puffy, uncomfortable, or protruding more than usual. These changes are not imaginary, and several physiological transformations occur overnight that directly influence the structures within the orbit.
Fluid redistribution during sleep
Lying down flat means that gravity no longer helps drain fluids from the face and orbit. Fluid that normally shifts downward collects in softer tissues around the eyes. For people with TED whose orbits are already inflamed and congested, this fluid accumulation amplifies eyelid swelling, under-eye puffiness, pressure sensations, worsened proptosis or appearance of proptosis and restricted eye movement or morning diplopia. So, this increased orbital venous congestion plays a meaningful role in symptom severity, especially in patients with active inflammatory TED.
Inflammatory activity peaks overnight
Inflammation tends to intensify at night due to the drop in cortisol levels. Cortisol is a natural anti-inflammatory hormone it is at its lowest levels overnight and early morning. In TED, with autoimmunity already attacking the orbital tissues, this natural dip allows for more swelling, increased orbital stiffness, heightened secretion of proinflammatory mediators leading to greater sensitivity to light and tenderness in and around the orbits upon waking up. This is one of the key reasons behind TED patients reporting that their eyes feel worst first thing in the morning.
How Sleep Position Influences Orbital Pressure
Not all sleep positions affect the orbit in the same way. The alignment of the head and upper body during majority of the sleep cycle determines how much fluid accumulates in the soft tissues around the eyes.
Sleeping flat on the back (or stomach) increases swelling
When the head is horizontally at level with the heart, venous drainage slows and orbital pressure rises. In TED patients, this can worsen eyelid edema (fluid accumulation) leading to worsening of proptosis appearance due to increased retro-orbital pressure, difficulty in moving the eyes on waking and difficulty in fully closing eyelids overnight. Many patients with exposure keratopathy (difficulty closing the eye fully) experience significant discomfort when sleeping flat.
Side-sleeping can worsen asymmetry
Because TED can be asymmetric (one eye affected more than the other), side-sleeping can aggravate swelling in the “downward” eye on the side resting on the pillow 4,5. Patients often report that the eye closest to the pillow appears puffier, irritated, protruding and more difficult to open in the morning
Sleeping with the head elevated reduces pressure
Research in orbital venous congestion shows that elevating the head reduces fluid pooling and inflammation 6. Having the head in a more upright position by up to 20–30 degrees (using pillows or an adjustable wedge) improves venous return and helps limit periorbital edema.
Why This Matters for Active TED
During the active phase of TED the orbital tissues are inflamed, thickened, and filled with excess glycosaminoglycans (GAGs), which retain water. GAGs are a complex of proteins and carbohydrates present in the extracellular matrix (the space between cells) and have the capacity to retain large amounts of water. Given the excess GAGs in TED, any external contributor that encourages fluid retention (like lying flat) exacerbates swelling. Patients in the active phase of TED are especially vulnerable to worsening eyelid retraction, increased conjunctival redness, temporary increase in double vision, exacerbation of corneal dryness and pain due to the increase in orbital pressure in the morning. Hence, proper sleeping position is a simple but important way to reduce symptom burden.
How Doctors Can Use Sleep-Related Clues in Diagnosis and Management
Since sleep position has such a significant effect on TED clinicians often inquire with their patients about the status of their eyes in the morning such as more puffiness after sleeping on one side or if elevating their head helps improve symptoms. This line of inquiry is important to distinguish between TED and other related but overlapping eye-related issues such as allergies, fluid-retention disorders, generic morning eyelid edema and sinus-related swelling. Because if symptoms disproportionately worsen overnight, it indicates active orbital inflammation. This determination is important to make decisions pertaining to start medical therapy, if imaging is needed, if corneal protection is required, whether eyelid taping or moisturizing goggles are necessary or if the patient is progressing towards a more severe disease stage. Sleep-related symptoms are also important when identifying the need for urgent evaluation, especially if morning vision changes or optic nerve symptoms appear.
Practical Sleep Strategies for Reducing TED Symptoms
The good news is that adjusting sleeping habits can make a meaningful difference and below are some evidence-based recommendations
Elevate your head
Use 2–3 pillows or a wedge to elevate the head by about 20–30 degrees and sleep on your back. Proven benefits include less periorbital swelling, reduced orbital pressure, improved eyelid closure, better corneal hydration and reduced morning diplopia upon waking up.
Avoid sleeping flat or on your stomach
Sleeping flat or on your stomach increases pressure on the orbits from contact with the pillows, potentially worsening corneal exposure or irritation.
Use a moisture mask or protective shield
TED worsens during nighttime because of dryness that arises from poor eyelid closure. A moisture mask can help maintain humidity, reduce exposure keratopathy, prevent overnight corneal damage and improve comfort in the morning.
Reduce fluid intake late in the evening
Reducing fluid intake just before sleeping is helpful for those suffering from persistent swelling in the morning.
Nighttime steroids or biologics when appropriate
For patients with significant nocturnal worsening, clinicians may adjust medication timing or prescribe nighttime steroids or biologicals to help reduce overnight inflammation.
When Sleep-Related Symptoms Signal Something More Serious
Patients should seek prompt evaluation if they experience vision changes upon waking, new or worsening double vision, severe morning pain, difficulty opening the eyelids, sudden increase in proptosis or increased redness or inability to close the eye. These may suggest optic nerve compression, corneal ulcers or rapid progression of inflammation. Sleep-related worsening can be a diagnostic clue that the disease is entering a more active or severe phase.
A Small Adjustment with a Big Impact
Sleeping position may seem like a minor detail, but for people living with TED, it is a simple and effective way to improve daily comfort and reduce disease-related swelling. Because TED symptoms are influenced by fluid dynamics, inflammation, and pressure, modifying how you sleep can significantly reduce morning discomfort, protect the eye surface, and even help doctors better understand the disease activity. Patients should include proper sleep posture as part of their larger TED management plan. If you are suffering from TED symptoms and want to learn more about proper sleeping posture, do not hesitate to schedule an appointment with Dr. Raymond Douglas.
References
- Shah, S. S. & Patel, B. C. in StatPearls (2025).
- Johnson, B. T., Jameyfield, E. & Aakalu, V. K. Optic neuropathy and diplopia from thyroid eye disease: update on pathophysiology and treatment. Curr Opin Neurol 34, 116-121 (2021). https://doi.org/10.1097/WCO.0000000000000894
- Chen, H. et al. Sleep quality and its determinants in patients with thyroid eye disease: a cross-sectional study. Eur J Med Res 30, 446 (2025). https://doi.org/10.1186/s40001-025-02691-4
- Wiersinga, W. M., Bleumink, M., Saeed, P., Baldeschi, L. & Prummel, M. F. Is sleeping position related to asymmetry in bilateral Graves’ ophthalmopathy? Thyroid 18, 541-544 (2008). https://doi.org/10.1089/thy.2007.0302
- Rana, K. et al. Asymmetric proptosis in thyroid eye disease. Int Ophthalmol 44, 206 (2024). https://doi.org/10.1007/s10792-024-03141-6
- Sattur, M. G., Patel, S. J., Helke, K. L., Donohoe, M. & Spiotta, A. M. Head Elevation, Cerebral Venous System, and Intracranial Pressure: Review and Hypothesis. Stroke Vasc Interv Neurol 3, e000522 (2023). https://doi.org/10.1161/SVIN.122.000522
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