# Sleep and mood: the luteal link

> Why you might sleep worse before your period, and why it hits your mood.

Category: Mind & mood · 2 min read · Written by the Splash team · Sources checked October 2026
URL: https://splash.care/learn/mind-mood/sleep-and-mood

## Quick answer

- Poorer sleep before and during a period is common with PMS and period pain.
- The luteal phase brings less REM sleep and a smaller night-time temperature dip.
- Consistent routines, daylight and less caffeine help.
- Insomnia lasting months is worth a GP visit.

Poor [sleep](https://splash.care/learn/movement-sleep/sleep-cycle) makes everything feel harder, and [the week before your period](https://splash.care/learn/phases/luteal) is prime time for it. A review of the research says poorer sleep quality before and during a period is common in people with [PMS](https://splash.care/learn/glossary/pms) symptoms or painful [cramps](https://splash.care/learn/period-care/cramp-relief). The NHS lists tiredness and trouble sleeping among [PMS](https://splash.care/learn/conditions/pms) symptoms.

## What is happening

In the [luteal phase](https://splash.care/learn/glossary/luteal-phase), the night-time dip in body temperature gets smaller and there is less REM sleep, according to sleep research. [Progesterone](https://splash.care/learn/glossary/progesterone) rises then falls around this time, which may play a part. Add cramps, [anxiety](https://splash.care/learn/mind-mood/luteal-anxiety) or night-time trips to change a product, and sleep can wobble.

## Sleep-friendly habits (from the NHS)

- Keep regular bed and wake times, even at weekends
- Get daylight and exercise earlier in the day, not within 4 hours of bed
- Keep your bedroom dark, cool and quiet
- Avoid tea, coffee, alcohol and smoking for at least 6 hours before bed
- Wind down for an hour before bed with reading, music or gentle stretching, away from screens
- Try not to nap in the day, as it can make night-time sleep harder
- If you are awake after about 20 minutes, get up, do something calm, and return when sleepy

**Myth:** Alcohol helps you sleep.

**Fact:** It may help you nod off, but the NHS lists alcohol as a common cause of insomnia, and it disrupts sleep later in the night.

> **Splash says:** log your sleep in Splash alongside your mood. If bad nights cluster before your period, you can plan an earlier, cosier bedtime that week.

### When to see a doctor

See a GP if poor sleep lasts for months, you feel exhausted most days, or sleep problems come with persistent low mood or anxiety. Our read on CBT-I explains the first-choice treatment for long-term insomnia.

## Sources

1. [Baker & Lee (2018) Menstrual cycle effects on sleep, Sleep Medicine Clinics](https://pubmed.ncbi.nlm.nih.gov/30098748/)
2. [NHS: Insomnia](https://www.nhs.uk/conditions/insomnia/)
3. [NHS Every Mind Matters: How to fall asleep faster and sleep better](https://www.nhs.uk/every-mind-matters/mental-wellbeing-tips/how-to-fall-asleep-faster-and-sleep-better/)
4. [NHS: PMS (premenstrual syndrome)](https://www.nhs.uk/conditions/pre-menstrual-syndrome/)

This is general information, not medical advice. Splash can’t diagnose. If you’re worried, talk to a GP, pharmacist or sexual health clinic. In an emergency call 999 (UK) or 911 (US).