Why some people wake at 5am without an alarm and others cannot.
Why this topic Everyone is wearing a sleep tracker and arguing with it.
Counted in Europe PMC, where the title or abstract names both this topic and that rsID. The number is papers, not evidence of a cause.
BDNF
Smoking behavior
7 papers →FTO
Obesity
5 papers →CYP1A2
Caffeine metabolism
3 papers →MTHFR
Folate metabolism (MTHFR C677T)
2 papers →ALDH2
Alcohol flush reaction
2 papers →ADH1B
Alcohol metabolism speed
1 paper →OPRM1
Opioid receptor sensitivity
1 paper →MEIS1
Restless legs syndrome
1 paper →TRIB1
Triglycerides
1 paper →BTBD9
Restless legs syndrome
1 paper →SLCO1B1
Statin muscle-side-effect risk
1 paper →TAS2R38
Bitter taste perception (PTC/PROP tasting)
1 paper →ZNF259
Triglyceride levels
1 paper →Europe PMC, title and abstract only, searched for “insomnia”, “sleep duration”, “chronotype”, “circadian preference” alongside each published rsID. Full text was not counted: it returns every paper with an rsID buried in a supplementary table. Recounted monthly.