13/03/2026
If your brain suddenly decides to replay every conversation you have ever had at 3am, poor sleep is often part of the story.
Sleep deprivation does far more than create tiredness. It affects how the brain processes information, regulates emotions and responds to stress, which is why patience shortens, concentration slips and small problems can suddenly feel disproportionately large.
Sleep is also when the body carries out essential functions of rest and repair. The brain clears metabolic waste, memory is consolidated, neurons recover from the demands of the day and immune function is supported.
Women are around 40% more likely than men to experience sleep difficulties, and sleeping less than six hours per night has been associated with a higher risk of cardiovascular disease. Poor sleep also raises cortisol and contributes to insulin resistance, which can make weight regulation more difficult.
Hormones influence sleep as well. Oestrogen and progesterone affect temperature regulation, neurotransmitters and sleep depth, which is why sleep patterns often shift during puberty, after pregnancy and during perimenopause.
If sleep has been difficult recently, a few small habits can help support it:
■ Get daylight early in the morning to anchor the circadian rhythm
■ Create boundaries with screens in the evening
■ Write down tomorrow’s tasks before bed to quiet the mind
■ Keep the bedroom cool
Sleep is not simply rest. It is when the brain recalibrates mood, memory and stress for the day ahead.