How broken sleep affects your body, and what to do on the harder days
Nicola Tik
If you are in the early weeks or months of being a new parent, chances are your sleep looks nothing like it used to. The broken nights, early mornings, and unpredictable patterns add up quickly, and they affect far more than how tired you feel. This article explains what is happening in your body during this period, and why everyday aches and physical effort can feel harder than usual right now.
Sleep is one of the most important ways the body manages pain. During deep sleep, the nervous system recalibrates, and part of that process involves resetting how sensitive it is to pain signals. When sleep is disrupted night after night, that recalibration does not happen fully.
The result is that the body becomes more responsive to signals it would normally filter out. Aches that would usually sit quietly in the background can feel more noticeable. Movements that are normally comfortable may feel less so. This is not a sign that something new is wrong. It is a well-established physical response to significant sleep loss, and it will not last forever.
Muscle repair happens primarily during sleep. Throughout the day, as you move, lift, and carry, small amounts of muscle fatigue build up. Sleep is when the body works through that backlog.
With disrupted sleep, that repair process is interrupted. Muscles that have not fully recovered carry their fatigue forward into the next day. Over time, this can mean they feel heavier or less responsive than usual, and that they tire more quickly under load. For new parents who are lifting, carrying, and feeding repeatedly throughout the day and night, this effect is particularly noticeable, and worth being kind to yourself about.
When muscles are fatigued and the body is more sensitive, it naturally adjusts how it manages physical effort. You may find yourself tensing more around certain movements, shifting your weight to one side, or avoiding positions that feel uncomfortable. These are normal, protective responses, not something you are doing wrong.
Over time, these adjustments can create their own strain, particularly across the neck, shoulders, and lower back, which tend to absorb the compensation. Being aware of this pattern is useful. It does not mean you need to override it. Small, conscious changes to how you are moving and carrying, when you have the capacity, can help reduce the cumulative effect.
On days when sleep has been particularly poor, your body may feel more sensitive, less resilient, and slower to recover from effort. That is your body doing its best under significant demand. It is not a sign that something is going wrong, and it is not a reflection of how you are coping.
A few things that tend to help when things feel harder: keeping movement gentle rather than pushing through stiffness, taking short breaks from sustained positions when you can, and being realistic about physical output on the days when your body is clearly running on very little. Lowering expectations of yourself on those days is not giving up. It is a sensible response to what your body is dealing with.
If you have a few minutes, VIDA has short videos you can follow at your own pace, which may help ease some of the tension that builds up during this period.