Why Do We Keep Wanting to Eat the Day After Sleeping Less?

The amount eaten or snack choices may change after sleeping for a short time. However, you cannot attribute all of that day’s appetite solely to sleep. First, distinguish whether there was a lack of time to sleep or if there was an opportunity to sleep but difficulty falling asleep. This article is not a guide that everyone will lose weight by increasing sleep, but a method to find conditions that can be changed between a lifestyle of short sleep and the next day’s meals.

What Is Short Sleep and How Is It Different from Insomnia?

The questions to solve differ between cases where one goes to bed late due to working late or screen time, and cases where one lies down early but remains awake for a long time. For the former, it is necessary to check whether sleep opportunity can be secured; for the latter, consider whether symptoms or conditions that interfere with sleep need evaluation. If all the time spent lying down is recorded as actual sleep time, the two situations become mixed.

Distinguish between the feeling of craving sweets the next day and the actual behavior of eating snacks. There may also be effects from skipping dinner the previous day or having a late breakfast the next day. Instead of evaluating as ‘failed due to lack of sleep,’ noting which schedule changed clarifies points for adjustment. Whether meals were missed due to resisting drowsiness or drinks were consumed whenever tired are different questions.

Why does sleeping less increase the desire to eat?

One possibility is a change in the signals involved in hunger and satiety. In a short crossover study involving 12 healthy young men, sleep restriction lowered leptin levels and increased ghrelin and subjective hunger. However, another small-scale study found that after staying awake all night, ghrelin and hunger increased but no difference in leptin was observed. Therefore, we cannot say that everyone’s leptin and ghrelin follow the same pattern of change after insufficient sleep, nor can we infer our hormone levels simply from the desire to eat. The sleep restriction study and the overnight sleep deprivation study should be read distinguishing their conditions and results.

Another is a change that makes food feel more appealing. In sleep deprivation experiments, the response of brain regions that evaluate the value of food changes, and the desire to eat high-calorie foods increases. This means that not only the sensation of being hungry but also the reaction of ‘that food is especially tempting’ can differ. These experiments do not reflect everyday short sleep conditions, and changes in food preference should not be interpreted as actual overeating by everyone. Study on food craving and brain response

The increased opportunity to eat due to longer waking hours should also be considered. Controlled laboratory studies observed additional late-night intake during sleep restriction. In daily life, this can be compounded by delayed first meals, skipped meals, and beverages consumed to counteract drowsiness. Therefore, when you find yourself wanting to eat more the next day, it is more concrete to look at what and when you actually ate from the last meal the previous day rather than concluding based solely on hormones or willpower. Study on sleep restriction and meal timing

What Do the Numbers and Duration in Research Tell Us?

A 2022 randomized clinical trial examined 80 overweight adults who usually slept less than 6.5 hours per day. The group counseled to increase sleep consumed on average about 270 kcal less energy per day over two weeks compared to the control group. This is a short-term study result targeting participants under specific conditions. It does not mean the same reduction occurs for everyone or that long-term weight loss is guaranteed. The study abstract provides details on subjects and design.

Do not use the study’s criterion for short sleep as a standard for an individual’s normal sleep needs. It cannot be applied as a prescription to ‘just lie down longer’ for people with insomnia or sleep apnea. The record-keeping suggested in this article does not reproduce the treatment program of that study.

How to Compare Tired Days and Less Tired Days?

It is easier to understand context by comparing similar workdays of the same person. On holidays, not only sleep but also meal locations and activities differ. Do not fill in missing record days as ‘days without problems’; leave them blank. If exact times are unknown, leaving notes like ‘later than usual’ is acceptable. Avoid going to bed later just to record details more precisely.

How to Decide Procedures for Changing Lifestyle?

1. Identify one main reason for shorter sleep. Separate tasks that must be done from those that can be postponed. Schedules difficult to change, like night shifts, should not be considered a matter of willpower.
2. Prioritize arranging meal opportunities for the next day. If preparing meals is hard on a tired morning, plan possible meals the day before. Do not reduce meals or force yourself to endure hunger as a form of self-punishment for less sleep.
3. Record small changes alongside actual responses. If screen time was moved earlier, check whether sleep actually increased and how the next day’s meal schedule went. Changing multiple habits at once makes it hard to know which choice was most comfortable.

In traditional Korean medicine consultations, you can explain not only sleep but also appetite, post-meal bloating, bowel movements, and fatigue patterns together. Traditional pattern identification is a framework for interpreting these patterns and is not a test to determine specific constitutions or prescriptions based solely on records. Bringing the timing when discomfort began along with current Korean herbal medicine, sleeping pills, or supplements can specify consultation questions. Do not arbitrarily add or stop medications.

Frequently Asked Questions FAQ

Does catching up on sleep during weekends solve appetite problems? The research cited in this article did not examine the effects of weekend catch-up sleep. Examine weekday schedules and ongoing drowsiness together.

How many more hours of sleep are needed to lose weight? No weight loss formula applicable to individuals can be provided. Confirm the reason for short sleep, and if problems persist despite sufficient sleep opportunity, it is better to get an evaluation.

What should you mention during your consultation? Inform your practitioner if you have loud snoring, have been told you stop breathing during sleep, experience overwhelming daytime sleepiness, or suffer from recurring insomnia. For consultation preparation, refer to Insomnia and Sleep Records and for meal context, see Nighttime Eating Patterns. If you are taking Korean herbal medicine, also review Product Ingredients and Precautions, and be sure to share the timing of any sleep changes and your medication list during your visit.

References

• Tasali et al., Randomized Clinical Trial on Sleep Extension and Energy Intake, 2022
• NIH: Getting sufficient sleep reduces calorie intake