Alcohol, high-saturated-fat meals, spicy foods, high-sugar snacks, hidden caffeine in chocolate and soda, aged cheeses, and heavy protein-rich meats are all linked by sleep researchers to lighter, more broken sleep, even when eaten hours before bed.
The National Sleep Foundation points out that caffeine can disrupt sleep even when consumed six hours before bedtime, while alcohol taken within two to three hours of sleep tends to lead to more overnight awakenings.
The cycle runs both ways.
Diets low in fiber and high in saturated fat or added sugar have been linked with sleep that is less restorative.
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Alcohol and the rebound awakening
A nightcap can shorten the time it takes to nod off, but the National Sleep Foundation warns it leads to lower-quality sleep and more frequent overnight awakenings, especially if taken within two to three hours of bedtime.
Once the sedative effect wears off in the second half of the night, people often wake suddenly and struggle to fall back asleep.
Heavy, high-fat dinners
Rich, greasy meals slow digestion at exactly the wrong time.
In research summarized by Johns Hopkins Medicine, rats fed a high-fat diet for eight weeks had more fragmented nighttime sleep and were excessively sleepy during the day, an effect the researchers linked to reduced sensitivity to orexin, a brain chemical that helps regulate wakefulness.
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Human observational data also connect diets high in saturated fat with less restorative sleep.
Spicy foods and heartburn
Johns Hopkins sleep expert Charlene Gamaldo, M.D., has cautioned that spicy dishes can trigger heartburn that makes it hard to lie down comfortably.
Capsaicin from chili peppers can also nudge core body temperature upward at the very moment the body is trying to cool down for sleep.
Johns Hopkins recommends avoiding spicy foods within three hours of bedtime.
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Sugar spikes and 3 a.m. wakeups
The National Sleep Foundation notes that excess sugar can cause you to awaken more frequently.
A late-night cookie or bowl of ice cream can pull the body through a blood-sugar rise and fall that overlaps with the middle of the night, when awakenings are already more common.
Hidden caffeine after lunch
Coffee is the obvious culprit, but caffeine also shows up in tea, soda, energy drinks, chocolate and even ice cream, according to the National Sleep Foundation.
Its effects can last up to six hours, and sometimes longer with high-caffeine drinks.
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Cleveland Clinic registered dietitian Alexis Supan advises cutting the last caffeine well before evening and stopping food intake about three hours before bed.
Aged cheeses and tyramine
Aged cheeses like sharp cheddar and creamy Camembert contain high levels of tyramine, an amino acid that can trigger a spike in blood pressure and heart rate in sensitive people, AARP reports, citing sleep and nutrition specialists.
That tyramine sensitivity can also make it harder to fall asleep. Tomatoes are another common source of tyramine, which Cleveland Clinic dietitian Julia Zumpano told AARP can increase brain activity and delay sleep.
Processed and heavy meats
High-protein foods like steak and chicken take a long time to digest, according to AARP's sleep expert panel, which is a problem because digestion slows by as much as 50 percent during sleep.
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AARP also flags cured meats such as salami and pepperoni, which contain naturally occurring amino acids that tighten blood vessels and raise blood pressure.
Practical takeaway from the authorities: shift alcohol, spicy dishes, sugary desserts and heavy meats to earlier in the evening, and stop eating roughly three hours before your usual bedtime.
This article is made and published by Ida-Marie Palm Varbæk, who may have used AI in the preparation.