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Fatigue - A feeling of tiredness or weariness usually associated with performance decrements.
Fiberoptic Nasopharyngoscope - A flexible fiberoptic scope used to examine the nasal passages, pharynx, hypopharynx and larynx.
Flattening Index - A number that indicates the amount of airflow limitation caused by partial closure of the upper airway. 0.3 indicates an open airway, 0.15 is mildly obstructed, 0.1 is severely limited airflow, and 0.0 reflects a totally closed airway. Flattening Index is used to identify a condition known as Upper Airway Resistance Syndrome (UARS), and is continuously recorded in some diagnostic sleep studies and CPAP titration studies.
Flow Limitation - Partial closure of the upper airway, which impedes the flow of air into the lungs.
Forbidden Zone - Period of strongest clock-dependent alerting, usually in the evening. Prevents falling asleep.
Fragmentation (pertaining to Sleep Architecture) - The interruption of a sleep stage due to the transition to a lighter stage, or to wakefulness, leading to disrupted sleep cycles.
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