Table 2.

Full search strategy.

PUBMED
AND	“suicidality”[tiab] OR “suicide”[tiab] OR “suicidal”[tiab] OR “suicide”[MESH] OR “suicidal ideation”[tiab] OR “suicidal behavior*”[tiab] OR “suicide death” [tiab] OR “suicide, attempted”[mesh] OR “suicide attempted”[tiab]
	“electrocardiography”[mesh] OR “ECG”[tiab] OR “electrocardiography”[tiab] OR “Electroencephalography”[mesh] or “Electroencephalography”[tiab] OR “EEG”[tiab] OR “EKG”[tiab] OR “polysomnography”[tiab] OR “polysomnography”[mesh] OR “fitness trackers”[mesh] OR “fitness tracker*”[tiab] OR “smart band*”[tiab] OR “fitbit*”[tiab] “apple watch”[tiab] “mobile”[tiab] OR “Biomarkers”[mesh] OR “Biomarker*”[tiab] OR “biological”[tiab] OR “Wearable electronic devices”[MESH] OR “actigraphy”[MESH] OR “actigraphy”[tiab] OR “sensor*”[tiab] OR “wearable*”[tiab] OR “electrocardiography”[MESH] OR “electrocardiography”[tiab] OR “smartphone”[mesh] OR “smartphone*”[tiab] OR “heart rate variability”[tiab] OR “HRV”[tiab] OR “heart rate”[mesh] OR “heart rate”[tiab] OR “Respiratory Sinus Arrhythmia”[mesh] OR “Respiratory Sinus Arrhythmia”[tiab] OR “RSA”[tiab]
	“Stress, Physiological”[MESH] OR “Stress”[tiab] OR “Stress, Psychological”[Mesh] OR “Depression”[mesh] OR “depression”[tiab] OR “Sleep initiation and maintenance disorders”[mesh] OR “circadian rhythm”[mesh] OR “circadian rhythm”[tiab] OR “exercise”[mesh] OR “exercise”[tiab] OR “depressive disorder”[mesh] OR “anxiety”[mesh] OR “anxiety”[tiab] OR “physical activity”[tiab] OR “insomnia”[tiab] OR “sleep deprivation”[tiab] OR “mental health”[mesh] OR “mental health”[tiab] OR “bipolar disorder”[mesh] OR “bipolar disorder”[tiab] OR “vagal tone”[tiab] OR “sleep quality”[tiab] OR “nightmare*” OR “Mood Disorders”[mesh] OR “Mood Disorders”[tiab] OR “psychosis”[tiab] OR “psychotic”[tiab] OR “Inhibition (Psychology)”[Mesh] OR “inhibition”[tiab] OR “impulsiveness”[tiab] OR “Dysthymic Disorder”[Mesh] OR “Dysthymic Disorder”[tiab] OR “hopelessness”[tiab] OR “Guilt”[Mesh] OR “Guilt”[tiab] OR “Self Concept”[Mesh] OR “Self Concept”[tiab] OR “Self esteem*”[tiab] OR “Social Isolation”[Mesh] OR “Social Isolation”[tiab] OR “Loneliness”[Mesh] OR “Loneliness”[tiab] OR “Psychomotor Agitation”[Mesh] OR “Psychomotor Agitation”[tiab] OR “Agitation*”[tiab]
EMBASE
AND	‘suicidal behavior’/exp OR ‘suicide’/exp OR ‘suicide attempt’/exp OR ‘suicidal ideation’/exp ‘suicidal behavior’/exp OR ‘suicide’/exp OR ‘suicide attempt’/exp OR ‘suicidal ideation’/exp OR ‘suicide’ OR ‘suicidal behavior’ OR ‘suicide attempted’ OR ‘suicidal ideation’ OR ‘suicide death’ OR ‘suicidality’
	‘electrocardiogram’/exp OR ‘electrocardiography’/exp OR ‘electroencephalogram’/exp OR ‘electroencephalography’/exp OR ‘polysomnography’/exp OR ‘activity tracker’/exp OR ‘fitbit’/exp OR ‘biological marker’/exp OR ‘actigraph’/exp OR ‘wearable sensor’/exp OR ‘wearable device’/exp OR ‘wearable technology’/exp OR ‘smartphone’/exp OR ‘heart rate variability’/exp OR ‘heart rate’/exp OR ‘respiratory sinus arrhythmia’/exp OR ‘electrocardiogram’ OR ‘electrocardiography’ OR ‘electroencephalogram’ OR ‘electroencephalography’ OR ‘polysomnography’ OR ‘activity tracker’ OR ‘fitbit’ OR ‘biological marker’ OR ‘actigraph’ OR ‘actigraphy’ OR ‘wearable sensor’ OR ‘wearable device’ OR ‘wearable technology’ OR ‘smartphone’ OR ‘heart rate variability’ OR ‘heart rate’ OR ‘respiratory sinus arrhythmia’ OR ‘fitness tracker’ OR ‘biomarker’
	‘stress’/exp OR ‘physiological stress’/exp OR ‘depression’/exp OR ‘sleep disorder’/exp OR ‘circadian rhythm’/exp OR ‘exercise’/exp OR ‘major depression’/exp OR ‘anxiety disorder’/exp OR ‘anxiety’/exp OR ‘physical activity’/exp OR ‘insomnia’/exp OR ‘sleep deprivation’/exp OR ‘rem sleep deprivation’/exp OR ‘mental health’/exp OR ‘bipolar disorder’/exp OR ‘sleep quality’/exp OR ‘vagus tone’/exp OR ‘nightmare’/exp OR ‘mood disorder’/exp OR ‘inhibition (psychology)’/exp OR ‘impulsiveness’/exp OR ‘dysthymia’/exp OR ‘hopelessness’/exp OR ‘guilt’/exp OR ‘self concept’/exp OR ‘self esteem’/exp OR ‘social isolation’/exp OR ‘loneliness’/exp OR ‘agitation’/exp OR’stress’ OR ‘physiological stress’ OR ‘depression’ OR ‘sleep disorder’ OR ‘circadian rhythm’ OR ‘exercise’ OR ‘major depression’ OR ‘anxiety disorder’ OR ‘anxiety’ OR ‘physical activity’ OR ‘insomnia’ OR ‘sleep deprivation’ OR ‘rem sleep deprivation’ OR ‘mental health’ OR ‘bipolar disorder’ OR ‘sleep quality’ OR ‘vagus tone’ OR ‘nightmare’ OR ‘mood disorder’ OR ‘inhibition (psychology)’ OR ‘impulsiveness’ OR ‘dysthymia’ OR ‘hopelessness’ OR ‘guilt’ OR ‘self concept’ OR ‘self esteem’ OR ‘social isolation’ OR ‘loneliness’ OR ‘agitation’ OR ‘psychosis’ OR ‘ activity level’