Abstract

Overview

A comprehensive study focusing on the impact of 2.45 GHz Wi-Fi signals on human sleep was conducted, incorporating a novel head exposure system designed for double-blind provocation studies.

Findings

• The exposure system featured six directional antennas arranged in a circle around the subject's head, ensuring uniform exposure without a preferred direction of incidence.
• This system is entirely computer-controlled, utilizing real WLAN signals that mimic various transmission patterns typical in actual WLAN environments. These include both "beacon only" phases and phases with varying data transmission rates.
• The study was conducted using a double-blind crossover design, thoroughly recording forward and reverse power for all antennas to maintain stringent quality control.
• Theoretical specific absorption rates (SAR) in cortical brain regions were approximated at 1-2 mW/kg, which reflects a realistic worst-case scenario in actual WLAN use.
• Considering fluctuations in head position, SAR levels in different brain regions could vary significantly, with peak spatial 10 g average SAR values ranging from 1.5-3.5 mW/kg in brain tissues, and 10.4-25 mW/kg in head tissues.

Conclusion

This study highlights significant health considerations related to Wi-Fi exposure during sleep, demonstrating potential variations in brain exposure levels that could impact health. These findings underscore the importance of further research into the effects of electromagnetic fields on human health.