The Science of Sleep and Weight: What the Research Really Tells Us

When we talk about weight loss, the conversation usually revolves around two things: what we eat and how much we move.

Protein. Steps. Strength training. Calories. GLP-1s. The latest diet.

But there may be another important part of the picture that gets considerably less attention.

SLEEP.

Growing research suggests that consistently getting too little sleep may influence appetite, food intake, activity levels and the way our bodies respond when we're trying to lose weight.

So if you're doing everything “right” but treating sleep as an afterthought, it might be time to make your nights part of your wellness routine too.

Less sleep, more weight?

A new 2026 study from researchers at Columbia University followed 95 adults who typically slept seven to eight hours a night.

During a six-week period, participants delayed their usual bedtime by 90 minutes. In practice, this reduced their sleep by around 80 minutes per night.

The result?

They gained an average of approximately one pound in just six weeks. They also spent around 17 additional minutes each day being sedentary during the sleep-restricted period.

That doesn't mean losing 80 minutes of sleep automatically makes everyone gain a pound. The researchers themselves say they are still investigating exactly why moderate sleep restriction contributed to the observed weight gain.

But this isn't the only research linking sleep and weight.

Sleep could affect how much we eat

One particularly interesting randomised clinical trial looked at 80 adults who usually slept for less than 6.5 hours per night.

Rather than putting them on a diet, researchers encouraged one group to sleep for longer.

Participants in the sleep-extension group increased their sleep by around 1.2 hours per night and consumed approximately 270 fewer calories per day compared with the control group during the two-week intervention.

That's important because it suggests sleep may influence energy intake even when people aren't consciously trying to restrict what they eat.

Researchers have also investigated appetite-regulating hormones. A study of 1,024 adults found that shorter habitual sleep was associated with lower leptin and higher ghrelin. These hormones are involved in regulating satiety and appetite, although hormonal responses are complex and this observational study cannot establish that short sleep directly caused the differences.

In other words, when you're tired, healthy choices may not simply be a question of willpower.

What about when you're actively trying to lose weight?

This is perhaps where the research gets most interesting.

In a controlled study published in Annals of Internal Medicine, adults following a calorie-restricted diet lost a similar amount of total body weight under two different sleep conditions.

But what they lost was different.

When participants had less sleep, a smaller proportion of the weight they lost came from fat and more came from fat-free body mass. The researchers concluded that insufficient sleep could compromise efforts to reduce body fat during dietary restriction.

Larger analyses point in a similar direction. A 2020 systematic review and meta-analysis involving more than 150,000 adults found that short sleep was associated with a higher risk of developing obesity. More recent research has also found an association between short sleep and a modestly higher risk of abdominal obesity.

None of this means that sleep is a weight-loss treatment.

It means that diet, movement and sleep shouldn't necessarily be thought about in isolation.

Your wellness routine doesn't stop when you go to bed

If you're focusing on your health or trying to manage your weight, sleep deserves a place alongside nutrition and movement.

And that's where we can help.

At Dreem Distillery, we're not here to tell you what to eat or how to exercise. We'll leave that bit to you. But when it comes to winding down, recovering and making sleep a priority, we're in this with you.

After a workout, make recovery part of the ritual. Massage Bed Balm into tired, hardworking muscles as part of your post-exercise wind-down.

For legs that still feel like they're going when the rest of you is ready for bed, massage Dreem Melt® Magnesium Butter into your feet and calves before turning in.

On slower evenings, run a warm bath and make time to properly switch off with The Z's Anchoring Bath Salts or Into The Deep Bath Oil.

And when it's finally time for bed, make Night Drops the final step in your evening ritual, created to help you slow down, switch off and support deeper, more restful sleep.

Because looking after yourself doesn't end with your last meal or your last workout.

It ends with a good night's sleep.

We're in this together.

You take care of the nutrition and movement.

We'll help you take care of the sleep.

SLEEP DEEPLY. LIVE BEAUTIFULLY.

References

1. Zuraikat FM et al. (2026), Annals of Internal Medicine — Prolonged Short Sleep and Its Effect on Body Weight and Composition. The Columbia study behind your original article: moderate sleep restriction over six weeks was associated with weight gain and increased sedentary time.

2. Tasali E et al. (2022), JAMA Internal Medicine — Effect of Sleep Extension on Objectively Assessed Energy Intake Among Adults With Overweight in Real-life Settings. Extending sleep by approximately 1.2 hours was associated with about 270 kcal/day lower energy intake versus control.

3. Nedeltcheva AV et al. (2010), Annals of Internal Medicine — Insufficient Sleep Undermines Dietary Efforts to Reduce Adiposity. Examined how restricted sleep affected body composition during calorie restriction.

4. Taheri S et al. (2004), PLOS Medicine — Short Sleep Duration Is Associated with Reduced Leptin, Elevated Ghrelin, and Increased Body Mass Index. Population study examining sleep duration, appetite-regulating hormones and BMI.

5. Bacaro V et al. (2020), Obesity Research & Clinical Practice — systematic review and meta-analysis finding short sleep duration was associated with increased risk of future obesity in adults.

6. Kohanmoo A et al. (2024), Obesity Science & Practice — systematic review and meta-analysis of prospective studies finding short sleep was associated with a modestly higher risk of central/abdominal obesity.