How does the Zeez Sleep pebble work? Is it safe? Does it zap your brain?

Scientists have known for more than a century that the neurons in our brain produce electrical fields. In 2010 a team from Yale University showed that weak external electrical fields can influence neurons to synchronise and produce more powerful electrical fields. The Yale research confirmed what we had already observed: our engineer, Steve Walpole, first used weak electrical fields to strengthen natural brain activity in1983. In the tradition of scientists, he had experimented on himself, using electrical devices to prevent migraines resulting from head injuries suffered in a catastrophic road accident.

Steve’s companies sold 20,000 migraine devices in the U.K. during the [1992-4], and devices he invented (the Enermed and Medigen) were trialled in the UK, US and Canada with patients suffering from M.S., Chronic Fatigue, and migraine.


The driver of the car which ploughed into Steve had fallen asleep. We are now using technology resulting from that experience to prompt good sleep. Our Zeez Sleep pebble contains patented electronics including a processor, small battery, and printed circuit board (PCB). All PCB’s generate an electromagnetic field, but ours is designed to be especially low power, and to match the electrical field naturally produced by neurons involved in relaxation and sleep. Our purpose is to create the kind of feedback loop observed by the Yale team, with the electrical field from the Zeez Sleep Pebble guiding and strengthening neural activity.

The power used by the Zeez Sleep Pebble to generate its electrical field is around 1% of that of a mobile phone. Too weak to cross the skull (no “zapping”) and too weak to be covered by EU electromagnetic compatibility regulations. It is a Low- Risk General Wellness Product within the FDA’s 2016 General Wellness Policy for Low Risk Devices. and it is far below limits suggested by the international guidelines on trans cranial stimulation.

The Zeez Sleep Pebble generates slow pulses below 12Hz to match those of the brain at rest. This contrasts with the fields of 50Hz+ generated by electrical equipment, and wireless fields in the KHz and GHz range. The Zeez frequencies do not interfere with electrical equipment, and there are no wireless frequencies.


The fields created by the Zeez Sleep Pebble are weaker than that of the Yale research, but most users report significantly better sleep. We have had hundreds of users. (Our return rate, selling on sale / return, is around 10%). Some find that a few weeks of Zeez use is sufficient to recover a long-term good sleep pattern. Others use the Zeez when periods of stress affect their sleep. Some use it daily, and have done so for upto 4 years. Reports of side effects are rare – a few people have reported initial headaches, too-deep sleep, and occasional sensations of vibration.

Anna McKay 2018
Yale research
Press Release fields-influence-brain-activity
Paper North Carolina research 2&fs=1&pg=18#pg18

A limited number of Zeez Sleep Pebbles is expected. Order as one of the first and receive a free sleep advice in the store.