Researchers find that high glycemic index foods are linked with a good night’s sleep, reports The Daily Mail.

The Japanese researchers also found eating bread products – including white bread, pancakes and pizza – had no effect on the quality of sleep.

They say eating food high on the glycaemic index (GI) – such as rice – was found to be associated with good quality sleep.

Foods with a high GI release sugar in the blood more quickly, leading to spikes in blood sugar levels that can last for a longer time.