The Healthspan Map · Sleep (Ch6)

Daytime alertness

What this is linked to

Where Daytime alertness is linked — 8 sources.In the order the Map holds them: strongest evidence first. That is a statement about the evidence, not about what matters most.
Nutrient or lever	Direction	Strength	Evidence type	What was found	Source
Daytime alertness	Watch this	Moderate	Systematic review	Sleep deprivation impairs attention and working memory; 7-8 h is optimal for cognition.	Sleep-cognition overview 2023 (opens in a new tab)
Daytime alertness	Watch this	Emerging	RCT / meta-analysis	Insomnia roughly doubles the risk of developing depression (OR 2.60); a core modifiable risk factor.	Baglioni et al. 2011 (opens in a new tab)
Daytime alertness	Watch this	Emerging	RCT / meta-analysis	Irregular sleep is a major migraine trigger; consistent sleep-wake schedules are a cornerstone of prevention.	Robblee & Starling 2019, Cleveland Clinic J Med; lifestyle-migraine meta 2024 (opens in a new tab)
Daytime alertness	Watch this	Emerging	Review / narrative	Irregular sleep is a major migraine trigger; consistent sleep-wake schedules are a cornerstone of prevention.	Robblee & Starling, "SEEDS for success: Lifestyle management in migraine", Cleve Clin J Med 2019 (opens in a new tab)
Daytime alertness	Watch this	Strong	Established clinical	Excessive daytime sleepiness is associated with impaired functioning, accidents and increased mortality.	Epworth Sleepiness Scale efficacy review (opens in a new tab)
Daytime alertness	Watch this	Moderate	Cohort / observational	Abnormal or worsening Epworth sleepiness was associated with higher 5-year all-cause mortality.	Veterans cohort (n=17,967, ESS and mortality) (opens in a new tab)
Daytime alertness	Watch this	Moderate	Established clinical	Excessive sleepiness reduces mental processing, concentration and reaction time.	Sleepiness and neurocognitive-function literature (opens in a new tab)
Daytime alertness	Watch this	Emerging	Cohort / observational	Persistent daytime sleepiness can signal underlying sleep-disordered breathing.	Sleepiness and obstructive-sleep-apnea literature (opens in a new tab)