No, turkey does not make kids sleepy in any special way. Turkey contains tryptophan, but so do chicken, cheese, milk, eggs and fish, in similar amounts, and the tryptophan in a mixed meal has a hard time reaching the brain. What makes a child drowsy after Thanksgiving dinner is the size of the meal, the stuffing, rolls and pie that come with it, and, for most small children, a holiday that ran straight over nap time. So the turkey can go on the kids’ plates without a second thought. The nap is what needs a plan.
What tryptophan is, and where the myth comes from
Tryptophan is an amino acid, one of the building blocks of protein. The National Library of Medicine’s MedlinePlus entry calls it “an essential amino acid”, which means the body can’t make it and has to get it from food. The same page says “the body uses tryptophan to help make melatonin and serotonin”, and that melatonin “helps regulate the sleep-wake cycle”.
That is the whole basis of the myth: turkey has tryptophan, tryptophan is a raw material for a sleep hormone, so turkey must make you sleepy.
The trouble is in the first step. MedlinePlus lists the food sources of tryptophan as cheese, chicken, egg whites, fish, milk, sunflower seeds, peanuts, pumpkin seeds, sesame seeds, soy beans and turkey. Turkey is one name on a list of ordinary foods your children eat every week. A Live Science explainer puts it more bluntly: “Gram for gram, cheddar cheese actually contains more tryptophan than turkey does.”
Why the turkey isn’t doing it
Eating tryptophan and getting it into the brain are different things. Scientific American put the question to MIT neuropharmacologist Richard Wurtman, who explained that turkey and other protein foods contain many amino acids, that tryptophan is the scarcest of them, and that it has to compete with several others for the same transport into the brain. In his words, “no food source contains tryptophan in the absence of other amino acids”.
Wurtman’s answer for what does cause the drowsiness: “Paradoxically, what probably makes people sleepy after Thanksgiving dinner is…dessert.” Carbohydrates trigger insulin, insulin clears most of the competing amino acids out of the blood, and tryptophan gets an easier ride. That points at the stuffing, the potatoes, the rolls and the pie, not the bird.
The same article gives a second, simpler reason. Stanford biologist H. Craig Heller told the magazine that “stretching of the small intestine induces sleepiness”, and that the body’s rest-and-digest mode after a meal “is conducive to sleep”. A very big meal makes people drowsy whatever is in it.
One caution. These explanations come from research on adults and animals. We did not find a study of children and Thanksgiving dinner, and we are not going to pretend one exists. The adults at the table also have wine, which the kids do not.
What actually makes kids sleepy on Thanksgiving
For a small child, the food is the smaller part of the story. Look at the day instead:
- Dinner at 2 or 3 p.m. That is the middle of nap time for most toddlers.
- An early start, a car ride and a house full of cousins. More excitement and less rest than a normal Thursday.
- A long wait at the table, followed by a bigger, sweeter plate than usual.
Betteroo’s plan for Thanksgiving Day with kids describes the same shape: “a slow morning, a busy kitchen, a big meal, and a long, sleepy afternoon”, and notes that “a busy holiday often means a skipped or short nap”. A three-year-old asleep on the sofa at 4 p.m. is usually a child who missed a nap at 1, and the turkey had little to do with it.
The nap that follows, by age
The ages and timings in this table are our own rules of thumb, not medical guidance. Your child’s usual schedule is the better guide.
| Age | What usually happens | What we would do |
|---|---|---|
| Baby | Naps on their own clock, whatever is on the table | Keep the usual naps. Put them down on their back on a flat, firm surface such as a travel crib, in a quiet room |
| Toddler on one nap | Dinner lands on top of the nap | Nap first and eat late, or give an early kids’ plate and nap during the adults’ meal |
| Preschooler, 3 to 5 | Says they don’t nap, then falls asleep at 4:30 | Offer quiet time after the meal. If they sleep, keep it short and wake them gently |
| School-age | Flops in front of a film | Let them. A walk before dark helps more than a nap |
A few notes on that table.
Babies sleep in a safe place, even at Grandma’s. A full house makes it tempting to let a baby nap on a sofa, in a car seat carried indoors or on a sleepy relative’s chest. The safe-sleep rules don’t take a holiday: on the back, on a flat, firm surface, with nothing loose around them. A portable crib such as the Graco Pack ‘n Play in a back bedroom solves it.
Preschoolers are the hard age. Many have dropped the daily nap, and many have not. Betteroo’s summary of the research says most children stop “somewhere between ages 3 and 5”, with a very wide spread. A child in that range who crashes after the meal probably needed the sleep.
A late nap moves bedtime. If a child sleeps from 4:30 to 5:30, a 7 p.m. bedtime will not work, and fighting it for an hour is worse than moving it. Push bedtime a little later for one night and run a shorter bedtime routine in the usual order.
The kids’ plate that makes the afternoon easier
This is the part the cook can control.
- Feed small children at their normal time. If dinner is at 3, a toddler’s plate at noon is kinder than a hungry two-hour wait. Our early family dinner plan works backward from the clock the same way.
- Turkey, one starch, one vegetable. A child-sized plate is a few bites of each, not a miniature of the adult pile.
- Pie after the nap, not before. Dessert is the part of the meal Wurtman points at, and it is easy to move. A slice at 5 p.m. is still Thanksgiving pie.
- A plain snack before bed if dinner was early. A child who ate at noon and picked at 3 will be hungry at 7. Our list of bedtime snacks for toddlers has the quick ones.
And before any adult takes their own nap: the food goes in the fridge within two hours. Our Thanksgiving leftovers chart covers how long each dish keeps after that.
Holiday naps all over the place?
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FAQ
Does turkey really have a lot of tryptophan?
Not more than other everyday protein foods. MedlinePlus lists turkey alongside chicken, cheese, milk, egg whites, fish, seeds and peanuts as sources, and Live Science notes that cheddar cheese has more, gram for gram.
Why is my child so tired after Thanksgiving dinner?
Most likely a missed or late nap, an early start and a very large meal with plenty of starch and dessert. The researchers quoted by Scientific American point to carbohydrates and the sheer amount of food, not the turkey.
Should I let my toddler nap after Thanksgiving dinner?
If they missed their usual nap, yes, in a safe, quiet place. Keep a late nap short, and expect bedtime to move a little later that night.
Does a big dinner help kids sleep better at night?
We did not find evidence that it does, and an overfull child is not a comfortable one. A normal-sized dinner at the normal time is the better bet.
