Impulse magnetic-field therapy for insomnia: A double-blind, placebo-controlled study

Abstract

This 4-week double-blind, placebo-controlled study assessed the efficacy of impulse magnetic-field therapy for insomnia. One
hundred one patients were randomly assigned to either active treatment (n = 50) or placebo (n = 51) and allocated to one of
three diagnostic groups: (1) sleep latency; (2) interrupted sleep; or (3) nightmares. Efficacy endpoints were intensity of
sleep latency, frequency of interruptions, sleepiness after rising, daytime sleepiness, difficulty with concentration, and
daytime headaches. In the active-treatment group, the values of all criteria were significantly lower at study end (P < .00001).
The placebo group also showed significant symptomatic improvement (P < .05), but the differences between groups were highly
significant (P < .00001). Seventy percent (n = 34) of the patients given active treatment experienced substantial or even
complete relief of their complaints; 24% (n = 12) reported clear improvement; 6% (n = 3) noted a slight improvement. Only
one placebo patient (2%) had very clear relief; 49% (n = 23) reported slight or clear improvement; and 49% (n = 23) saw no
change in their symptoms. No adverse effects of treatment were reported.