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antihistamine → Causes → drowsiness	0.63
generation antihistamine (subgroup of antihistamine) → Causes → drowsiness	0.59
codeine → Causes → drowsiness	0.52
benzodiazepine → Causes → drowsiness	0.50
drug → Causes → drowsiness	0.48
medicine → Causes → drowsiness	0.48
barbiturate → Causes → drowsiness	0.47
narcotic → Causes → drowsiness	0.42
opiate → Causes → drowsiness	0.38
diazepam → Causes → drowsiness	0.37
sleep deprivation → Causes → drowsiness	0.36
alcohol → Causes → drowsiness	0.36
melatonin → Causes → drowsiness	0.35
thc → Causes → drowsiness	0.35
use → Causes → drowsiness	0.32
adenosine → Causes → drowsiness	0.32
carbon monoxide → Causes → drowsiness	0.31
dehydration → Causes → drowsiness	0.30
xanax → Causes → drowsiness	0.29
viagra → Causes → drowsiness	0.29
lack → Causes → drowsiness	0.27
hormone → Causes → drowsiness	0.27
sleeping pill → Causes → drowsiness	0.27
inhalation → Causes → drowsiness	0.26
promethazine → Causes → drowsiness	0.26
chemical → Causes → drowsiness	0.25
oxygen → Causes → drowsiness	0.24
ibuprofen → Causes → drowsiness	0.24
marijuana → Causes → drowsiness	0.23
eating → Causes → drowsiness	0.23
methadone → Causes → drowsiness	0.22
gas → Causes → drowsiness	0.22
lemon balm → Causes → drowsiness	0.20
sugar → Causes → drowsiness	0.20
breathing → Causes → drowsiness	0.19
combination → Causes → drowsiness	0.19
abuse → HasSubevent → drowsiness	0.16
antibiotic → Causes → drowsiness	0.16
atenolol → Causes → drowsiness	0.16
bromine → Causes → drowsiness	0.16
kava → Causes → drowsiness	0.16
morphine → Causes → drowsiness	0.16
msg → Causes → drowsiness	0.16
remedy → Causes → drowsiness	0.16
smoke → Causes → drowsiness	0.16
alcohol (aspect of beer) → Causes → drowsiness	0.16