Sleep hygiene

Core practices

Timing:

• Consistent sleep schedule — same bedtime and wake time, including weekends; the biggest single intervention for many people
• Sleep duration — most adults need 7-9 hours; individual variation; consistency matters more than perfection
• Light timing — bright morning light within 30 min of waking; dim evening light starting 2-3 hours before bed

Environment:

• Cool — 60-67°F is the most-supportive range for most people; cool body temperature signals sleep
• Dark — eliminate light sources; blackout curtains; eye mask if needed
• Quiet — earplugs, white noise, or sound conditioning if needed
• Comfortable — bed, pillow, bedding adequate for your sleep position

Daytime habits:

• Morning sunlight exposure — 5-15 minutes in direct morning light; sets [[circadian-rhythm|circadian rhythm]]
• Daily physical activity — improves sleep quality; not too close to bedtime
• Avoid late caffeine — caffeine half-life ~5-6 hours; 2pm cutoff for many; 12pm for sensitive
• Limit alcohol — disrupts sleep architecture even at moderate doses
• Don’t nap late — afternoon naps reduce night-sleep drive; if napping, do it before 3pm and limit to 20-30 min

Pre-sleep:

• Wind-down routine — 60-90 minutes of decreasing-stimulation activity before bed
• Screen reduction — blue-light-emitting screens suppress melatonin; reduce 1-2 hours before bed; use night-shift / red-light modes
• Cognitive offloading — write down tomorrow’s tasks/concerns; reduces in-bed rumination
• Relaxation practices — slow breathing, progressive muscle relaxation, body scan

Why sleep matters

Sleep is foundational to virtually every health outcome:

• Memory consolidation — sleep is when learning becomes durable
• Cognitive function — short sleep dramatically impairs attention, decision-making, emotional regulation
• Metabolic health — sleep deprivation produces insulin resistance and increased hunger
• Cardiovascular health — short sleep is a major cardiovascular risk factor
• Immune function — sleep is when immune memory and antibody production peak
• Emotional regulation — sleep deprivation amplifies negative emotion and reduces capacity to manage it
• Longevity — chronic short sleep is associated with substantial mortality increases
• Glymphatic clearance — recently-discovered brain-fluid system clears metabolic waste during sleep

When to seek clinical care

Sleep hygiene helps most people, but doesn’t address:

• Sleep apnea — common, often undiagnosed; loud snoring, witnessed pauses, daytime sleepiness; clinical evaluation needed
• Insomnia disorders — chronic insomnia despite good sleep hygiene; CBT-I (cognitive-behavioral therapy for insomnia) is first-line
• Restless legs syndrome / periodic limb movement disorder
• [[circadian-rhythm|Circadian rhythm]] disorders — shift work, jet lag, delayed/advanced sleep phase
• Other sleep disorders

For these, sleep hygiene is supportive but not sufficient.

See also

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• Shares approach with: [[sleep]]
• Member of: [[practice]]

Sources

• Why We Sleep, Matthew Walker (Scribner, 2017)
• Andrew Huberman lab protocols and podcast episodes
• American Academy of Sleep Medicine clinical guidelines

Rooted in life.