Table 1.

Brief definitions of sleep subscales.

Subscale	Definition
Insomnia
Initial Insomnia	Difficulty initiating sleep in the beginning of the night.
Fragmented Sleep	Difficulty staying asleep.
Night Anxiety	Excessive worrying while trying to initiate sleep.
Light Sleep	Easily awoken during the night.
Lassitude
Non-Restorative Sleep	Feeling that sleep has been insufficiently refreshing.
Excessive Sleep	Sleeping more than recommended (>12 hours).
Fatigue	Excessive sleepiness, or low energy during the day.
Parasomnia
Nightmares	Unpleasant, frightening, or disturbing dreams.
Movement at Night	Recurrent movement (kicking, jerking, flailing) while asleep.
Sensations at Night	Unpleasant or uncomfortable feelings in limbs at night (restless legs).
Circadian Rhythm
Irregular Schedule	Varying sleep and wake times.