Possible causes
- Stress and rumination – in lighter sleep the brain easily switches into problem-solving mode.
- Early cortisol rise – with chronic stress, morning cortisol can rise earlier than needed.
- Alcohol in the evening – it makes you drowsy at first but fragments sleep in the second half of the night.
- Blood sugar swings – a sweet or late heavy dinner can lead to a reactive drop in glucose.
- Hormonal changes – perimenopause, night sweats or changes in progesterone.
- Environment and breathing – heat, light, noise, the urge to urinate, or snoring and sleep apnea.
What to check
- Sleep diary – note waking time, evening meal, alcohol and stress for at least two weeks.
- Glucose and HbA1c – possibly a short-term glucose sensor if you suspect night-time dips.
- TSH – an overactive thyroid can cause light, broken sleep.
- Ferritin and magnesium – deficiency is linked to restless sleep and restless legs.
What helps
- Regular wake-up time – including weekends; it stabilises your internal clock.
- Morning daylight – 10–20 minutes outside after waking strengthens the sleep-wake rhythm.
- Lighter dinner 2–3 hours before bed – with protein and fibre, without sweets or alcohol.
- Cool, dark bedroom – around 17–19 °C, blackout, no screen by the bed.
- Don't check the clock when you wake – breathe slowly with a longer exhale; if you are not asleep within 20 minutes, get up into dim light and return when sleepy.
When to see a doctor
See a doctor if the waking has lasted more than three months, if your partner hears you snore or gasp for air, if you wake sweaty or with a racing heart, have morning headaches, marked daytime sleepiness or symptoms of depression.