Pain and sleep have a particularly unkind relationship. Pain makes it harder to fall asleep, harder to stay asleep, and harder to reach the deep, restorative stages of sleep that the body needs. And poor sleep, in turn, lowers the pain threshold – making the nervous system more sensitive, making pain feel more intense, and making it harder to cope with.
For people living with chronic pain, this cycle can become self-sustaining: pain worsens sleep, sleep deprivation worsens pain, and around it goes. Understanding the connection – and what can interrupt it – is genuinely important.
What Sleep Does for Pain
During deep sleep, the body undertakes a significant amount of repair and maintenance. Anti-inflammatory processes are more active. The nervous system's pain-processing pathways are reset. Growth hormone – important for tissue repair – is released primarily during deep sleep stages. The brain's glymphatic system clears metabolic waste, including substances associated with inflammation.
When sleep is consistently disrupted, all of these processes are compromised. Studies have shown that even one night of poor sleep can significantly increase pain sensitivity the following day – and that chronic sleep deprivation produces a state of heightened pain processing that compounds over time.
How Pain Disrupts Sleep
The disruption flows in both directions. Physical discomfort makes it difficult to settle into a comfortable position. Pain in the night causes waking, sometimes repeatedly. Anxiety about pain – about what it means, about the next day, about whether it will ever improve – creates a mental arousal state that is incompatible with sleep. Some pain medications can also disrupt sleep architecture.
Many people with chronic pain also develop what's called "sleep effort" – a kind of anxious monitoring of sleep, trying too hard to fall asleep, which paradoxically makes sleep harder to come by. This is one of the key targets of CBT for Insomnia (CBT-I), the most effective treatment for chronic insomnia.
Breaking the Cycle: Practical Approaches
Prioritise sleep as part of pain management – not as a nice-to-have but as a genuinely therapeutic intervention. Improving sleep may reduce pain more than many people expect.
Consistent sleep and wake times – going to bed and waking at the same time every day anchors the circadian rhythm and tends to improve sleep quality over time, even when nights are disrupted.
Temperature management – a cool room helps sleep onset. For those whose pain is worsened by cold (as in some forms of arthritis), layering and a warm bath before bed can help raise body temperature ready for the natural drop that facilitates sleep.
Magnesium – magnesium glycinate taken before bed may support deeper sleep and also has mild muscle-relaxing effects that may reduce pain overnight. An Epsom salt bath in the evening provides magnesium transdermally while also being deeply calming.
Lavender aromatherapy – a few drops of lavender essential oil on a pillow or diffused in the bedroom has reasonable evidence for improving sleep quality and may reduce pain-related anxiety at bedtime.
Wind-down routine – a consistent pre-sleep routine that includes something calming (gentle stretching, breathing exercises, reading, a bath) signals to the nervous system that the day is ending. For people in pain, gentle movement before bed can also reduce overnight stiffness.
Managing overnight pain – the right pillow and mattress configuration can significantly affect pain during sleep. Support between the knees when lying on one's side, or under the knees when lying on the back, reduces spinal load. A physiotherapist can advise on positioning for specific conditions.
Limiting alcohol – alcohol may feel like it helps sleep, but it significantly disrupts sleep quality in the second half of the night and suppresses REM sleep, leaving the person feeling unrefreshed. For people in pain, the net effect is generally negative.
Breathwork – slow, deep breathing (such as box breathing: four counts in, four hold, four out, four hold) activates the parasympathetic nervous system and can help break the cycle of pain-related anxiety that prevents sleep onset.
CBT-I: The Most Effective Treatment
For persistent insomnia – including the kind that comes alongside chronic pain – Cognitive Behavioural Therapy for Insomnia (CBT-I) has the strongest evidence of any treatment, outperforming sleep medication in studies, with lasting effects. It addresses the thoughts, behaviours, and patterns that perpetuate insomnia, and it can be accessed through your GP, through specialist sleep services, or through digital programmes (Sleepio is an NHS-approved digital CBT-I programme available free in many areas).
When to Speak to Your GP
If sleep disruption is severe and persistent, it's worth raising with your GP – both to explore whether there are treatable causes (including sleep apnoea, which is more common in people with chronic pain) and to discuss whether CBT-I or other interventions might be appropriate.