Insomnia is a frequent complaint brought to the
physician's attention. Its prevalence in the general
population ranges from 9% for persistent sleep disturbances
to 27% for occasional insomnia [1,2]. Valid
instruments are needed to assist health care practitioners
in the assessment of insomnia complaints.
Although polysomnography is the `gold standard'
for assessing sleep disorders such as sleep apnea, it
is not recommended for routine use in the clinical
assessment of insomnia [3]. Furthermore, it is not
readily available to most clinicians.