So there’s a British woman who’s been in the news recently for diagnosing herself with a sensitivity to electromagnetic radiation. She sleeps in a $500 EMF-blocking sack and has reportedly stayed in the sack, from time to time, for 30-hour stretches.

The woman— 70-year-old Rosi Gladwell of Totnes, Devon—helps lead a small advocacy group on the issue of EMF-related health issues, and she even got the mayor of the Spanish village where she now lives to look into ways to limit Wi-Fi access for residents. She fears that the introduction of 5G mobile networks will kill her.

Now seems like a good time to remind readers that there is no evidence to support the idea of “electromagnetic hypersensitivity.” The World Health Organization calls it “idiopathic environmental intolerance with attribution to electromagnetic fields,” or IEI-EMF.