Bananas a cure for insomnia?

Countless magazines and lifestyle resources recommend taking a glass of milk or eating a banana in order to make you sleepy. Such foods contain tryptophan, an amino-acid which has been linked to sleep.

However, such "tryptophan snacks" have not been shown to induce sleep, say Dr Ng and Dr Kwok.

In fact, some health resources note that over twenty glasses of milk would be needed in order to provide sufficient levels of tryptophan to make one sleepy.