If you’re one of the 30% of Brits living with insomnia, you’ve probably tried everything to get a good night’s sleep. Magnesium? Tick. Hot baths? Tick. Counting sheep? Come on. Chronic sleeplessness can be agony – especially when there seems to be no reason for it. But, as one sleepy writer has been finding out, our menstrual cycle can play a role in our ability to drift off into restorative kip. Katie Wright spent a year getting to know her hormonal rhythm and finally found some answers to her decades-long insomnia.