The perception of time in people with Ehlers-Danlos Syndrome (EDS), especially the hypermobile subtype, is a topic that is underexplored in the scientific literature, but extremely interesting from a neurobiological point of view. The central point is that the organism of these people frequently lives in a state of “internal mismatch” between body, brain, and environment. This alters not only pain and movement, but also how they perceive day, night, fatigue, time zones, and even their own body space.
Although Ehlers-Danlos syndrome does not directly alter the circadian clock, there are important indirect connections between hypermobility, the autonomic nervous system, proprioception, and sensory integration. It is precisely at this intersection that many people with EDS report a subjective sensation that differs from biological time.
The first relevant issue involves the autonomic nervous system. Many individuals with EDS exhibit dysautonomia, especially forms such as postural orthostatic tachycardia syndrome (POTS). This means that the brain receives unstable bodily signals related to blood pressure, heart rate, temperature, and balance. The body begins to oscillate between states of hyperactivation and exhaustion. When this occurs, the brain loses some of the physiological predictability that normally helps organize temporal perception.
The human biological clock relies on relatively stable internal cues: body temperature, cortisol secretion, melatonin release, energy fluctuations, and vestibular signals. In people with EDS, these cues are often fragmented. As a consequence, there are reports of:
- The sensation of “longer” days during autonomic crises;
- difficulty in perceiving the passage of time;
- Partial reversal of the sleep-wake cycle;
- sensation of nocturnal cognitive alertness;
- Extreme fatigue during the morning;
- greater sensitivity to environmental changes and time zones.
Another important point is the vestibular system, responsible for balance and spatial orientation. In individuals with hypermobility, there is a higher incidence of cervical instability, ligamentous laxity, and proprioceptive alterations. The brain receives less precise information about body position and movement. This helps explain why many patients develop a greater tendency towards nausea, motion sickness, and vomiting.
Nausea, in this context, is not just gastrointestinal. It arises from a conflict between sensory systems. The brain compares:
- what the eyes see;
- what the inner ear detects;
- What the muscles and joints tell us.
When this information becomes conflicting, nausea arises. In hypermobile individuals, this integration may already be naturally more unstable due to altered proprioception. Small changes in movement, speed, lighting, or time zone can generate a state of neurosensory overload.
This may explain why some people with EDS describe long trips as “disorganizing” experiences for the entire body. It’s not just sleep that changes. The brain loses predictable internal reference points.
There is also a little-discussed detail: collagen is present in vascular and support structures of the nervous system. In some individuals with EDS, there is greater vascular compliance, which can reduce the efficiency of cerebral venous return when changing position. This favors episodes of “brain fog,” dizziness, a feeling of temporal unreality, and cognitive fatigue. In these situations, the subjective perception of time often changes. Minutes can seem like hours, while entire periods of the day become hazy in memory.
When an evening chronotype is added to this picture, the effect tends to intensify. The brain already has a genetic tendency to delay the release of melatonin and increase nocturnal cortical activity. If the body also has to deal with chronic pain, dysautonomia, proprioceptive instability, and fragmented sleep, adapting to the time zone becomes particularly difficult.
Interestingly, many patients report feeling “more alive” at night. This may be because the nighttime period offers less sensory load: less noise, less postural demand, fewer social stimuli, and less autonomic activation. The brain enters a state of lower defensive vigilance and is able to better organize its own internal signals.
There is an interesting neurophysiological hypothesis here: part of the altered sense of time in people with hypermobility may not come solely from the circadian clock, but from the brain’s constant need to recalibrate the body. An organism that needs to continuously monitor balance, pain, blood pressure, muscle tension, and joint position consumes more internal attentional resources. This modifies the subjective experience of time.
I noticed something similar while reading some recent papers on interoception and neurodivergence: the greater the load of unconscious body monitoring, the more “elastic” subjective time tends to become. The brain begins to operate less by the external clock and more by internal physiological intensity.
Therefore, in people with Ehlers-Danlos syndrome, it may be more accurate to think not only of joint hypermobility, but of an expanded form of neurophysiological hypermobility, where multiple systems of the body oscillate simultaneously: sleep, body perception, balance, energy, digestion, pain, and sensory integration.
