Homeostatic sleep pressure
Track pressure that accumulates with wakefulness and dissipates during sleep.
Side 229Side Studies / Research
Subject
Sleep & Circadian Rhythms
Purpose
Sleep and biological timing studied through homeostatic pressure, circadian clocks, sleep stages, light and effects on cognition and physiology.
Structure
05 movesMechanism mapV0
Entities → interactions → mechanisms → scales → measurement
Separate sleep pressure from circadian timing.
Sleep timing and quality emerge from interacting homeostatic and circadian systems, making time of day as important as total sleep duration.
Circadian clock
Study endogenous timing generated by the suprachiasmatic system and entrained by environmental cues.
Sleep architecture
Separate NREM and REM stages and their cycling across the night rather than treating sleep as one uniform state.
Light & entrainment
Examine how timing, intensity and spectrum of light shift circadian phase and alertness.
Cognition & physiology
Connect sleep loss and misalignment to attention, memory, metabolism, mood and health without treating every association as causal.
Keep the boundaries visible.
sleepiness ≠ circadian phase
time in bed ≠ sleep duration
sleep stage ≠ single function
Questions that organize the Side.
Why can someone feel alert after long wakefulness at one circadian phase and sleepy at another?
Which cognitive deficits reflect sleep loss versus circadian misalignment?
How do individual chronotypes alter optimal timing?
What should carry weight here?
Polysomnography, actigraphy, circadian markers and controlled sleep manipulation should be distinguished; self-reported sleep alone is insufficient for many mechanistic claims.