Natural Sleep Aids: Magnesium, Melatonin and What They Actually Do

Melatonin: A Timing Signal, Not a Sedative

Melatonin is the hormone that signals to your body that it is night, not a sedative that forces sleep. It is most useful for shifting your body clock — jet lag, shift work, or a delayed sleep schedule — at low doses (0.5-3mg is typically sufficient; more is not necessarily better). Taking a large dose expecting a stronger sedative effect is a common and largely pointless mistake.

Magnesium: An Indirect Relaxation Pathway

Magnesium supports GABA activity (your brain's main calming neurotransmitter) and muscle relaxation, which is why it is associated with easier, deeper sleep — particularly in people who are mildly deficient. Magnesium glycinate is commonly preferred over other forms because it is well absorbed and less likely to cause the digestive upset associated with magnesium oxide.

Glycine and L-theanine

Both are lower-profile but reasonably well-supported options: glycine (an amino acid) may lower core body temperature slightly, which helps sleep onset, while L-theanine promotes a calm, non-drowsy relaxed state useful for winding down before bed rather than for sedation itself.

What None of These Fix

Supplements address contributing factors, not the two most common actual causes of poor sleep: an inconsistent schedule/light exposure, and an anxious, ruminating mind at bedtime. If those are the real driver, sleep hygiene changes or treating the underlying anxiety will do more than any supplement.