Sleep Hygiene and Recovery Cheat Sheet

Updated 2026-07-27

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Sleep is not a passive state but an active biological process governed by circadian rhythms, homeostatic sleep drive, and environmental cues. Quality sleep depends on consistent timing, optimized environments, and behavioral strategies that align with your body's natural sleep-wake cycle. Sleep restriction and stimulus control—cornerstones of cognitive behavioral therapy for insomnia (CBT-I)—are among the most effective non-pharmaceutical interventions, with research consistently showing improvements in sleep efficiency and total sleep time. The key insight: sleep hygiene is not about perfection but about creating conditions that reduce arousal, strengthen bed-sleep associations, and honor your circadian biology.

What This Cheat Sheet Covers

This topic spans 14 focused tables and 88 indexed concepts, 86 flashcards, 4 practice tests with 104 questions. Below is a complete table-by-table outline of this topic, spanning foundational concepts through advanced details.

Table 1: Circadian Rhythm RegulationTable 2: Sleep Schedule and TimingTable 3: Pre-Sleep Wind-Down TechniquesTable 4: Bedroom Environment — Temperature and DarknessTable 5: Bedroom Environment — Noise and Air QualityTable 6: Caffeine, Alcohol, and Dietary TimingTable 7: Napping StrategiesTable 8: Sleep Tracking MetricsTable 9: CBT-I Core TechniquesTable 10: Relaxation and Breathing TechniquesTable 11: Sleep SupplementsTable 12: Advanced Sleep TechniquesTable 13: Insomnia-Specific InterventionsTable 14: Shift Work Sleep Strategies

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Table 1: Circadian Rhythm Regulation

Light, timing, and temperature are the three primary signals that set your body clock; the rows below ranked from the most powerful daily levers to the more specialized interventions. Getting the sequence right — bright mornings, dim evenings, consistent timing — is the single highest-leverage move in all of sleep hygiene.

Technique	Example	Description
Morning light exposure	`5-10 min outdoors within 1 hour of waking`	• Suppresses melatonin and advances circadian phase • blue-enriched light most effective for entrainment.
Circadian consistency	`Wake 7 AM weekdays + weekends`	• Same wake time daily (±30 min) anchors when you get morning light, your clock's main reset signal • linked to worse metabolic and cardiovascular markers even when total sleep duration is normal.
Evening light avoidance	`Dim lights 2 hours before bed, <100 lux`	• Blue light (450-480nm) keeps suppressing melatonin much longer than red light does • avoid bright, blue-heavy screens in the evening.
Meal timing window	`Eat within 10-hour window (8 AM - 6 PM)`	• Eating close to bedtime is linked to more nighttime awakenings by overlapping with your body's melatonin rise • trial evidence on sleep benefits from earlier eating windows is still mixed, so treat it as a mild edge, not a guarantee.
Exercise timing	`Finish vigorous exercise ≥4 hours before bed`	• High-strain exercise within about 2 to 4 hours of bedtime delays sleep onset and lowers quality • light or moderate evening exercise shows little to no effect, so the old blanket "no evening workouts" rule is outdated.
Dawn simulator alarm clock	`Light gradually brightens over 20-30 min before wake time`	• Mimics a gradual sunrise before your alarm • measured to reduce sleep inertia and improve alertness and reaction time compared with waking to a sudden alarm in the dark.
Light therapy box	`10,000 lux box, 20-40 min within 1 h of wake (16-24 in. from face)`	• Used for SAD, phase-delayed sleep disorder, and jet lag • devices filter out UV rays; sit at the prescribed distance, since lux drops off sharply beyond about 24 in.
Jet lag light protocol	`Bright light AM at destination (eastward travel)`	• Seek light during destination morning, avoid evening light • combine with strategic melatonin for phase shifts.
Social jet lag	`Weekend sleep midpoint within 1 hour of weekday`	• Shifting sleep >1 hour on weekends disrupts circadian rhythm • keep schedule variance <50 min to minimize health impacts.

Table 2: Sleep Schedule and Timing

Wake time is the anchor of your sleep-wake system, more so than bedtime. These strategies cover how to set, shift, and maintain a schedule that fits both your biology and your daily obligations.

Strategy	Example	Description
Consistent wake time	`Wake 6:30 AM every day (including weekends)`	• Wake time is the anchor that synchronizes circadian rhythm • more important than consistent bedtime.

The rest of this section is part of the full cheat sheet

Table 3: Pre-Sleep Wind-Down Techniques

The 60 to 90 minutes before sleep are when the nervous system transitions from high arousal to sleep-ready, and this transition can be accelerated or sabotaged by behavior. These techniques are ranked from highest-impact to more supportive practices.

Method	Example	Description
Digital curfew	`All screens off 60+ min before bed`	• Screen use delays sleep onset even with blue light filters • arousal content more disruptive than light alone.

The rest of this section is part of the full cheat sheet

Table 4: Bedroom Environment — Temperature and Darkness

Your sleep environment is a biological signal, not just a comfort preference. Core body temperature must drop 1-2°F to initiate and maintain deep sleep, and the rows below cover how to engineer that drop and protect against light disruption.

Factor	Example	Description
Optimal temperature	`60-67°F (15-19°C), target 65°F`	• Cool environments facilitate the core body temperature drop needed for sleep • going warmer or colder than this range increases nighttime wakefulness and reduces REM sleep.

The rest of this section is part of the full cheat sheet

Table 1: Circadian Rhythm Regulation

Technique	Example	Description
Morning light exposure	`5-10 min outdoors within 1 hour of waking`	• Suppresses melatonin and advances circadian phase • blue-enriched light most effective for entrainment.
Circadian consistency	`Wake 7 AM weekdays + weekends`	• Same wake time daily (±30 min) anchors when you get morning light, your clock's main reset signal • linked to worse metabolic and cardiovascular markers even when total sleep duration is normal.
Evening light avoidance	`Dim lights 2 hours before bed, <100 lux`	• Blue light (450-480nm) keeps suppressing melatonin much longer than red light does • avoid bright, blue-heavy screens in the evening.
Meal timing window	`Eat within 10-hour window (8 AM - 6 PM)`	• Eating close to bedtime is linked to more nighttime awakenings by overlapping with your body's melatonin rise • trial evidence on sleep benefits from earlier eating windows is still mixed, so treat it as a mild edge, not a guarantee.
Exercise timing	`Finish vigorous exercise ≥4 hours before bed`	• High-strain exercise within about 2 to 4 hours of bedtime delays sleep onset and lowers quality • light or moderate evening exercise shows little to no effect, so the old blanket "no evening workouts" rule is outdated.
Dawn simulator alarm clock	`Light gradually brightens over 20-30 min before wake time`	• Mimics a gradual sunrise before your alarm • measured to reduce sleep inertia and improve alertness and reaction time compared with waking to a sudden alarm in the dark.
Light therapy box	`10,000 lux box, 20-40 min within 1 h of wake (16-24 in. from face)`	• Used for SAD, phase-delayed sleep disorder, and jet lag • devices filter out UV rays; sit at the prescribed distance, since lux drops off sharply beyond about 24 in.
Jet lag light protocol	`Bright light AM at destination (eastward travel)`	• Seek light during destination morning, avoid evening light • combine with strategic melatonin for phase shifts.
Social jet lag	`Weekend sleep midpoint within 1 hour of weekday`	• Shifting sleep >1 hour on weekends disrupts circadian rhythm • keep schedule variance <50 min to minimize health impacts.

Table 2: Sleep Schedule and Timing

Wake time is the anchor of your sleep-wake system, more so than bedtime. These strategies cover how to set, shift, and maintain a schedule that fits both your biology and your daily obligations.

Strategy	Example	Description
Consistent wake time	`Wake 6:30 AM every day (including weekends)`	• Wake time is the anchor that synchronizes circadian rhythm • more important than consistent bedtime.

Table 3: Pre-Sleep Wind-Down Techniques

Method	Example	Description
Digital curfew	`All screens off 60+ min before bed`	• Screen use delays sleep onset even with blue light filters • arousal content more disruptive than light alone.

Table 4: Bedroom Environment — Temperature and Darkness

Factor	Example	Description
Optimal temperature	`60-67°F (15-19°C), target 65°F`	• Cool environments facilitate the core body temperature drop needed for sleep • going warmer or colder than this range increases nighttime wakefulness and reduces REM sleep.