What Your Sleep Has to Do With What You’re Craving

We don't usually think about eating and sleeping as things that go together, as it's pretty rare to do them at the same time. But they are deeply connected.

Both are regulated by the circadian rhythm and a complex interplay of hormones that directly influence each other. When one is off, the other often follows.

If we want to make meaningful changes to sleep, we can't ignore eating. And if we're trying to improve our relationship with food, sleep has to be part of the conversation too.

How sleep affects eating

When we don't get enough sleep or the quality of our sleep is poor, it changes how our bodies regulate hunger.

Research shows that even two nights of sleep restriction can lower leptin levels. Leptin is often called the satiety hormone because it helps signal when we are full. At the same time, sleep deprivation increases ghrelin, the hormone that stimulates appetite.

In simple terms, less sleep makes it harder to feel satisfied and easier to feel hungry.

Sleep deprivation has also been linked to stronger cravings for sweets and highly processed, high calorie foods. When you're exhausted, your body looks for fast energy, and that usually shows up as sugar and simple carbs.

How eating affects sleep

The relationship goes both ways. What we eat can also influence how well we sleep.

Some studies suggest that certain foods may support better sleep. Eating higher amounts of fruits and vegetables is associated with less disrupted nighttime sleep. In addition, foods that contain tryptophan like egg whites, cheese, and soybeans, as well as foods that contain melatonin like milk, nuts, and cherries, have shown sleep promoting effects.

On the flip side, diets high in processed foods and added sugars are generally associated with poorer sleep quality.

Even though it's not a food, alcohol also plays a role here. It disrupts normal sleep architecture by decreasing REM sleep and increasing night awakenings, leading to more fragmented and less restorative sleep overall.

Meal timing matters too

It's not just what we eat, but also when we eat.

Several studies have found that irregular meal schedules are associated with poorer sleep. Research has shown higher odds of insomnia in adolescents with inconsistent eating patterns, poorer self reported sleep quality in university students with irregular mealtimes, and more sleep problems among adults with inconsistent daily meal schedules.

There's also a consistent association between skipping breakfast and later bedtimes, although studies have not been able to prove direct causation. Still, the pattern shows up often enough to be worth paying attention to.

The takeaway

Eating and sleeping are deeply connected. You can't fully support one without considering the other.

When sleep is off, hunger signals get louder and cravings change. When eating patterns are irregular or heavily processed, sleep quality often suffers.

Supporting one helps stabilize the other, and small, consistent shifts in both areas can make a noticeable difference in how you feel day to day.

Bazzani A, Faraguna U. Eat Well, Sleep Well: Exploring the Association Between Eating Behavior and Sleep Quality. Nutrients. 2025 Sep 8;17(17):2908. doi: 10.3390/nu17172908. PMID: 40944296; PMCID: PMC12430387.

Oussama Saidi, Emmanuelle Rochette, Lou Dambel, Marie-Pierre St-Onge, Pascale Duché, Chrono-nutrition and sleep: lessons from the temporal feature of eating patterns in human studies - A systematic scoping review, Sleep Medicine Reviews, Volume 76, 2024, 101953, ISSN 1087-0792, https://doi.org/10.1016/j.smrv.2024.101953.