2. Bananas
Although bananas are seen as a health food that boosts energy, it is high in potassium, magnesium and tryptophan and so will help you sleep better. Tryptophan is especially effective in this regard since it is the precursor to the two neurotransmitters, serotonin and melatonin, which control sleep. You can add bananas to your morning (or evening) oatmeal to maximise the effect.