Clinical approach to excessive daytime sleepiness

Area of Science:

• Sleep science
• Clinical neurology
• Psychophysiology

Background:

• Subjective sleepiness, a personal feeling of alertness or sleepiness, is underutilized in clinical evaluations.
• Objective sleepiness stems from the homeostatic need for sleep.
• Assessing objective sleepiness typically involves behavioral observation, assuming increased sleep need correlates with a higher likelihood of falling asleep.

Purpose of the Study:

• To explore the definitions and clinical evaluation methods for subjective and objective sleepiness.
• To discuss the limitations and challenges in accurately measuring objective sleepiness.

Main Methods:

• Review of existing definitions and clinical approaches to evaluating sleepiness.
• Discussion of laboratory-based tests like the Multiple Sleep Latency Test (MSLT) and Maintenance of Wakefulness Test (MWT).
• Consideration of naturalistic measures such as the Epworth Sleepiness Scale (ESS).

Main Results:

• Subjective sleepiness is an internal state, while objective sleepiness is inferred behaviorally.
• Objective sleepiness assessment relies on measuring the propensity to fall asleep.
• Factors beyond the homeostatic sleep drive can influence sleep behavior, complicating objective measurement.

Conclusions:

• Current methods for evaluating objective sleepiness, including laboratory tests and daily life assessments, have limitations.
• No single method is considered the definitive "gold standard" for measuring objective sleepiness.
• Further research may be needed to refine objective sleepiness assessment tools.