Melatonin
Strong evidenceAlso known as: N-acetyl-5-methoxytryptamine
A hormone the body makes in the evening as a sleep signal.
What it is used for
Contributes to the reduction of time taken to fall asleep.
Dosage
1 mg thirty minutes before bed.
Safety notes
May cause drowsiness. Not for pregnancy, breastfeeding, under 18s, or before driving.