How to sleep: Avoid steak and chicken or high protein foods before bed

The charity adds: “Diet is also multifaceted. It isn’t just one food; instead, it is cumulative, affected by when, what, and how much we eat throughout a day and over weeks, months, and years.

“Individuals can have distinct reactions to different diets, making it hard to generalise about the perfect diet for everyone.

“Because of these factors, it’s hard to design research studies that provide conclusive answers about the optimal food for sleep.”

Indeed, it says: “Given the complexity of diet and sleep, for many people it may be more meaningful to focus on the big picture — healthy sleep and diet habits — rather than on individual foods and drinks.”