a relationship that works both ways
sleep and hormones influence each other in both directions. sleep is when several important hormonal processes take place, and in turn, hormone levels help regulate the body's sleep and wake cycle. disrupting one side of this relationship tends to have knock on effects on the other.
hormones that follow the sleep and wake cycle
- melatonin rises in the evening in response to darkness, helping signal to the body that it's time to sleep
- cortisol typically follows an opposite pattern, being lowest around bedtime and rising in the early morning to support waking and alertness
- growth hormone is released mainly during deep sleep and is involved in tissue repair and recovery
- prolactin also tends to rise during sleep
this daily rhythm, sometimes called the circadian rhythm, helps coordinate hormone release with the natural pattern of a 24 hour day.
how poor sleep can affect other hormones
when sleep is consistently short, disrupted or poor quality, this can ripple out to other hormonal systems. poor sleep has been linked with changes in insulin sensitivity and the hormones that regulate appetite, and may also affect cortisol patterns and, for some people, aspects of reproductive hormone regulation and the menstrual cycle. the relationship is complex and appears to vary between individuals.
hormones that can affect sleep
the relationship works both ways, and hormonal changes can also affect sleep quality. for example:
- fluctuating oestrogen and progesterone across the menstrual cycle can affect sleep for some people, particularly in the days before a period
- the hormonal shifts of perimenopause and menopause are commonly linked with sleep disturbances, including night sweats
- thyroid hormone imbalances, both underactive and overactive, can affect sleep patterns
- elevated cortisol from ongoing stress can make it harder to fall or stay asleep
supporting healthy sleep patterns
general habits that are widely understood to support healthy sleep include keeping a fairly consistent sleep and wake time, getting exposure to daylight, particularly in the morning, limiting bright light and screens close to bedtime, and creating a calm, comfortable sleep environment. these are general wellbeing measures rather than a treatment for a specific hormonal condition.
when sleep problems might be hormone related
occasional poor sleep is normal and usually not a sign of a hormonal problem. persistent sleep disruption, especially alongside other symptoms such as changes in mood, weight, energy or menstrual cycle regularity, may be worth discussing with a professional.
if sleep problems are ongoing or affecting your daily life, please speak with a doctor or another qualified healthcare professional, who can help identify whether an underlying cause, hormonal or otherwise, needs addressing.