hintl / Sleep
Sleep, by the evidence
Supplements and habits for sleep, each scored by the strength of the published research behind it — study counts, participant totals, and the direction of the evidence, not marketing claims.
30items
supplements & habits
94studies
reviewed
42,549participants
across those studies
hintl editorial team / Sleep Research Desk
Sleep genre desk — research review
For Sleep, the studies with the strongest track record so far are chamomile (93/100, 4 studies), lavender (90/100, 5 studies), and physical activity (79/100, 2 studies) (hintl Evidence Score, as of October 2026).
Evidence for bedroom temperature and hops humulus lupulus is still limited.
Same topic, very different evidence
Even within one topic, how strongly the research backs each option varies widely. Here's what the numbers show.
Ranked by strength of evidence
Tap any item to see the studies behind its score.
93/100
Confidence: high
chamomile
sleep quality4 studies1,017 participants
90/100
Confidence: high
lavender
sleep onset latency5 studies902 participants· 1 more outcome
79/100
Confidence: high
physical activity
sleep quality2 studies2,396 participants
79/100
Confidence: high
melatonin
sleep onset latency2 studies1,808 participants· 1 more outcome
79/100
Confidence: high
mindfulness intervention
sleep quality2 studies1,054 participants
79/100
Confidence: high
music listening
sleep quality2 studies1,101 participants
79/100
Confidence: high
valerian
sleep quality2 studies6,966 participants· 1 more outcome
74/100
Confidence: moderate
cognitive behavioral therapy for insomnia
sleep quality2 studies16,513 participants
74/100
Confidence: moderate
magnesium
sleep quality2 studies3,964 participants· 1 more outcome
73/100
Confidence: high
L-theanine
sleep quality4 studies229 participants
71/100
Confidence: high
honey
sleep quality3 studies473 participants
69/100
Confidence: moderate
saffron
sleep quality2 studies499 participants
65/100
Confidence: moderate
kiwifruit
sleep quality4 studies48 participants
63/100
Confidence: moderate
tart cherry
sleep quality3 studies19 participants· 1 more outcome
60/100
Confidence: moderate
glycine
sleep onset latency4 studies46 participants· 1 more outcome
59/100
Confidence: moderate
ornithine
sleep quality2 studies243 participants
54/100
Confidence: moderate
hot bath timing
sleep quality2 studies90 participants
53/100
Confidence: moderate
blue light evening
sleep quality3 studies44 participants
52/100
Confidence: moderate
breathing exercises
sleep quality1 study347 participants
50/100
Confidence: moderate
GABA
sleep quality7 studies89 participants
46/100
Confidence: low
light exposure
sleep quality3 studies1,508 participants
42/100
Confidence: low
caffeine timing
sleep quality1 studyparticipant count not recorded
42/100
Confidence: low
passiflora
sleep quality1 study110 participants
42/100
Confidence: low
tryptophan
sleep quality1 studyparticipant count not recorded
42/100
Confidence: low
weighted blanket
sleep quality1 study50 participants
39/100
Confidence: low
casein hydrolysate
sleep quality1 study48 participants
39/100
Confidence: low
sleep regularity
sleep quality1 study19 participants
37/100
Confidence: low
Apocynum venetum
sleep quality1 studyparticipant count not recorded
28/100
Confidence: very low
hops humulus lupulus
sleep quality3 studies17 participants
26/100
Confidence: very low
bedroom temperature
sleep quality3 studies195 participants
Evidence Scores are computed mechanically from the published research (PubMed / Semantic Scholar / OpenAlex): study design, participant numbers, and consistency across studies. An LLM is used only to extract study data, never to decide a score.
This is research-based information, not medical advice, and not a diagnosis. Consult a qualified professional about your own situation.