Chronic insomnia does not typically resolve
spontaneously, although the presenting form of
insomnia (i.e., initial, middle, or late) can vary over
time8
. For instance,subjectsin one study presented with
an average chronicity of 10 yr at their initial assessment
and 88 per cent continued to report insomnia 5 yr later9
.
Insomnia is also a highly co-morbid condition and
appears more frequently as a co-morbid illness than as
primary insomnia1