Can Poor Sleep Cause Weight Gain? What to Know About Sleep and Obesity

Quick Answer: Poor sleep can make weight gain more likely. Not getting enough sleep can increase hunger, lead you to eat more, affect blood sugar control, and leave you too tired to stay active. Obesity can also make it harder to sleep well, especially if conditions such as sleep apnea, acid reflux, asthma, or joint pain interrupt your rest.

Obesity means having excess body fat that can affect your health. Adults with a body mass index, or BMI, of 30 or higher are considered to have obesity, while a BMI between 25 and 29.9 is considered overweight. In fact, about 40% of U.S. adults have obesity. [1] 

Obesity is connected to several health problems, including type 2 diabetes, high blood pressure, heart disease, fatty liver disease, joint pain, and sleep apnea. Sleep can affect body weight too. If you do not get enough sleep, you may feel hungrier, have more trouble controlling your blood sugar, and feel more tired during the day.

Why can poor sleep lead to weight gain?

Not getting enough sleep can change how hungry you feel, what foods you crave, and how active you are the next day. Sleep deprivation can also affect how your body responds to insulin.

You may feel hungrier

People often feel hungrier after a short night of sleep. Controlled sleep studies have found that people tend to feel hungrier and eat more when their sleep is restricted.

Leptin and ghrelin are hormones that help regulate appetite. Ghrelin signals hunger, while leptin helps signal fullness. Sleep loss may affect these hormones, but not always in the same way. Your appetite is also shaped by cravings, stress, eating habits, and how long you stay awake. [2] 

You may eat more

When you are sleep-deprived, high-calorie foods and snacks can seem more tempting. Being awake longer also means you have more chances to eat, especially late at night.

In one controlled study, people ate more calories and gained more weight when their sleep was restricted. Researchers also found increases in abdominal and visceral fat during the restricted-sleep period. [3] 

Blood sugar can become harder to control

Insulin moves glucose from your blood into your cells so your body can use it for energy. If your body becomes less sensitive to insulin, it gets harder to control your blood sugar.

Controlled studies have found that restricting sleep can reduce insulin sensitivity. Changes in sleep timing can affect it as well. [4]

You may be less active the next day

After a bad night’s sleep, you may feel too tired to exercise. You may also move less during the day, whether that means walking less, sitting more, or putting off physical activity because you feel worn out.

If you regularly do not get enough sleep, lower activity levels can make weight management harder.

Your sleep schedule matters too

Your body’s internal clock, called the circadian rhythm, helps regulate sleep, eating, and how your body handles glucose.

Working night shifts, staying up late often, or eating when you would usually be asleep can throw off that rhythm. Circadian misalignment has been linked with changes in food intake, glucose control, and energy use that may make weight gain more likely over time. [5]

Also read: Why Sleep is Important for Your Health

Does sleeping more help with weight loss?

Getting enough sleep can make weight loss easier to manage, especially if you usually do not get enough rest.

Short sleep can make you hungrier, make high-calorie foods harder to resist, and leave you with less energy to exercise. Sleep can also affect how much body fat you lose during a calorie-restricted diet.

One study found that adults following a calorie-restricted diet lost a similar amount of total weight whether or not their sleep was restricted. But the group that slept more lost a greater proportion of that weight as body fat. [6]

Another trial looked at adults with overweight who usually slept less than 6.5 hours per night. After increasing their sleep by about 1.2 hours, they ate roughly 270 fewer calories per day without being given a diet or exercise plan. [7]

Getting enough sleep can help with:

• Hunger and food cravings

• Daytime energy

• Exercise and physical activity

• Blood sugar control

• Sticking with planned eating habits

Can obesity make it harder to sleep?

Yes, people with obesity are more likely to have problems such as snoring, sleep apnea, daytime sleepiness, and poor sleep quality.

Extra body fat can make breathing more difficult during sleep, especially when there is more tissue around the neck and upper airway. 

Some people with obesity have insomnia symptoms, including trouble falling asleep or staying asleep. The connection appears to be stronger when insomnia occurs together with short sleep. [8]

Also Read: Can Better Sleep Help You Manage Your Weight?

Why can obesity interfere with sleep?

Poor sleep in people with obesity can happen for different reasons. Breathing problems are one of the biggest concerns, but other health issues can also make it harder to fall asleep, stay asleep, or feel rested the next day.

Obstructive sleep apnea

Obstructive sleep apnea, or OSA, happens when the upper airway narrows or closes during sleep. This can cause breathing to stop for short periods before starting again.

Signs of OSA can include:

• Loud, frequent snoring

• Pauses in breathing noticed by someone else

• Waking up gasping or choking

• Dry mouth in the morning

• Morning headaches

• Daytime sleepiness

• Trouble concentrating

Obesity is one of the major risk factors for OSA. Extra tissue around the upper airway can make it easier for the airway to collapse while you sleep.

In December 2024, the FDA approved Zepbound (tirzepatide) for adults with obesity and moderate to severe obstructive sleep apnea. Tirzepatide acts on GIP and GLP-1 receptors and is used with a reduced-calorie diet and increased physical activity. 

Obesity hypoventilation syndrome

Obesity hypoventilation syndrome, or OHS, is a breathing disorder that can develop in some people with obesity. Breathing becomes too shallow to remove enough carbon dioxide, causing carbon dioxide levels in the blood to remain too high even while the person is awake.

OHS often occurs together with obstructive sleep apnea. It can cause daytime sleepiness, fatigue, shortness of breath, and loud snoring. Because OHS can cause more serious breathing problems than OSA alone, it requires medical evaluation and treatment. [9]

GERD

Gastroesophageal reflux disease, or GERD, causes stomach contents to repeatedly move back into the esophagus. Higher body weight is associated with a greater risk of GERD. [10]

Obesity can increase pressure inside the abdomen, which can make reflux more likely. Hiatal hernia is also more common as BMI increases and can make it easier for stomach contents to move upward into the esophagus. [11]

Symptoms often get worse after you lie down. Heartburn, regurgitation, coughing, or a sour taste in your mouth can make it hard to fall asleep or wake you during the night. Frequent nighttime reflux can also leave you tired the next day because your sleep keeps getting interrupted.

Asthma

Obesity is associated with a higher risk of asthma and can make symptoms harder to control in some people. Extra weight around the chest and abdomen can reduce lung volume, while inflammation associated with excess body fat may also affect the airways. [12]

Asthma can also get worse at night. Coughing, wheezing, chest tightness, and shortness of breath can make it hard to fall asleep or wake you several times. Poorly controlled nighttime asthma can leave you feeling tired even if you spend enough time in bed.

Type 2 diabetes

Obesity is a major risk factor for type 2 diabetes, and diabetes can affect sleep in several ways.

High blood sugar can make you thirsty and cause you to urinate more, even at night. Nerve damage from diabetes can also cause burning, tingling, or pain in the feet and legs, making it hard to get comfortable. 

Sleep apnea is also common in people with type 2 diabetes, which can make sleep quality even worse.

Osteoarthritis and joint pain

Extra body weight puts more pressure on weight-bearing joints, especially the knees and hips. Over time, this can contribute to osteoarthritis or make existing joint pain worse.

Pain can make it hard to find a comfortable sleeping position and may wake you when you move at night. People with knee and hip osteoarthritis often have poorer sleep, especially when pain is more severe. [13]

Depression and anxiety

Depression and anxiety can affect both the duration and quality of your sleep. Some people have trouble falling asleep or wake up frequently, while others may sleep longer than usual yet still feel tired.

Changes in mood can also affect eating habits. Some people eat more when they feel stressed, depressed, or anxious, while others may struggle with binge eating, which can contribute to weight gain over time. Binge eating commonly occurs alongside mood and anxiety disorders and can also occur with other psychiatric conditions. [14]

Some medications used to treat mental health conditions can also cause weight gain in some people, including certain antipsychotics and mood stabilizers. [15]

Can obesity cause insomnia?

Obesity does not always cause insomnia, but people with obesity report insomnia symptoms more often.

Trouble sleeping can have many causes, including sleep apnea, reflux, asthma, pain, depression, or anxiety. These problems can make it hard to fall asleep, stay asleep, or get back to sleep after waking.

Insomnia can include:

• Trouble falling asleep

• Waking up repeatedly during the night

• Waking up too early and being unable to fall back asleep

• Feeling tired or having trouble functioning during the day despite having enough time to sleep

Also Read: Insomnia as a Mental Illness?

Can losing weight improve sleep?

Losing weight can help with some sleep problems if excess weight is contributing to them.

Obstructive sleep apnea is one of the clearest examples. Losing weight can reduce pressure around the upper airway and lower the number of breathing interruptions during sleep.

Weight loss may also help reduce nighttime reflux and make movement more comfortable for people with joint pain.

Insomnia can still happen after losing weight if stress, anxiety, medications, sleep habits, or another sleep disorder is causing it.

How much sleep do you need when managing your weight?

Most adults should get seven or more hours of sleep per night regularly. 

Sleep quality matters too. Spending enough time in bed does not always mean you are getting good, restful sleep.

You may not be sleeping well if you:

• Wake up tired most mornings

• Wake up repeatedly throughout the night

• Need frequent naps

• Snore loudly

• Wake up gasping or choking

• Regularly struggle to stay awake during the day

• Spend enough time in bed but still feel exhausted

What can you do to improve your sleep?

Making a few changes can help you get enough sleep and keep your sleep schedule on track.

• Keep a regular sleep schedule. Try to go to bed and wake up around the same time each day.

• Give yourself enough time to sleep. If you often go to bed too late, you may not get enough rest even if you fall asleep right away.

• Stay active during the day. Regular exercise can help you sleep better and support weight management.

• Avoid large meals right before bed. This is especially helpful if you have nighttime reflux.

• Limit caffeine later in the day. It can stay active for hours and make it harder to fall asleep.

• Avoid alcohol close to bedtime. It can make sleep more fragmented and may worsen snoring or breathing problems.

• Get daylight during the day. Natural light helps keep your sleep and wake schedule regular.

• Keep your bedroom dark, quiet, and comfortable.

• Take care of symptoms that wake you at night. Frequent reflux, pain, coughing, wheezing, or needing to use the bathroom can all disrupt sleep.

• Watch for loud snoring or pauses in breathing. These can be signs of obstructive sleep apnea.

Frequently asked questions

Can lack of sleep cause belly fat?

Getting too little sleep on a regular basis has been linked with more abdominal and visceral fat. Over time, changes in appetite, eating habits, and activity may contribute to more fat around the waist. 

Does sleep affect metabolism?

Yes. Sleep affects insulin sensitivity, blood sugar control, appetite, and how your body uses energy. Not getting enough sleep over time can make these harder to regulate.

Can sleep apnea cause weight gain?

Sleep apnea does not directly cause weight gain in everyone, but the daytime tiredness it causes can make it harder to stay active. Gaining weight can also make sleep apnea worse by adding more tissue around the upper airway.

Why can obesity make you feel tired even after sleeping?

Feeling tired after enough time in bed can be a sign that your sleep is being interrupted or is not restorative. In people with obesity, obstructive sleep apnea is a common reason. Obesity hypoventilation syndrome can also cause significant daytime sleepiness and fatigue. If you regularly wake up tired despite getting enough sleep, talk with a healthcare provider.

Can too much sleep cause weight gain?

Some studies have found that long sleep duration is linked with obesity, but that does not mean sleeping longer causes weight gain. Some people sleep longer because of poor sleep quality, depression, illness, medication effects, or recovery from previous sleep loss. More than nine hours of sleep may also be appropriate for some adults, including people recovering from sleep debt or illness.

The bottom line

Poor sleep can make you hungrier, change your eating habits, affect your blood sugar, and leave you with less energy during the day. Obesity can also make it harder to get good sleep, especially if sleep apnea, reflux, asthma, joint pain, or another condition interrupts your rest.

Getting enough good-quality sleep can help with weight management and leave you feeling more rested during the day. If your sleep has changed, feels worse than usual, or keeps affecting how you feel or function, talk with your healthcare provider to check for any underlying health problems.

About the author

Dr. Ruchir P. Patel, MD, FACP, is the Medical Director of the Insomnia and Sleep Institute of Arizona and the founder of Sip2Sleep. He is triple board-certified in sleep medicine, obesity medicine, and internal medicine. Dr. Patel is a multi-year Phoenix Magazine Top Doctor and holds the Inspire Excellence designation.

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