Once again, most nuts and seeds are high in tryptophan – with pumpkin seeds topping the charts at 576mg per 100g (that’s 206% of of recommended allowance).

All nuts and seeds contain a healthy dose of protein, which can keep you fuller for longer, as well as aiding muscle repair, so they’re a good option before bed.

However, studies have shown that carbohydrates help deliver tryptophan into the blood stream, so you’re best off sprinkling your nuts into a little milky porridge or spreading nut butter onto wholemeal bread.