Ever reach for a pastry, an extra coffee, or something sweet after a rough night? It's not a lack of willpower. Sleep plays a big part in how hungry you feel and what you crave.
Why does tiredness make you hungrier?
Your appetite is guided by two hormones. Leptin tells you you're full, and ghrelin tells you you're hungry. When you're short on sleep, leptin drops and ghrelin rises, so you feel hungrier than usual.¹
Your brain gets in on it too. After a sleepless night, the areas that help you weigh up food choices are less active, and high-calorie foods suddenly look a lot more tempting.²
So that mid-afternoon craving isn't a character flaw. It could just be your body responding to a short night of sleep.
Over time, this pattern may add up. Across studies of more than 600,000 people, those who regularly slept less were more likely to live with obesity.³ That's a link rather than proof, but it fits with what we know about appetite.
Can more sleep help?
It looks that way. When you’re well rested, your hunger hormones are better balanced and high-calorie foods lose some of their pull. Sleep won’t replace a balanced diet, but it can make healthier choices feel a lot easier.
In one trial, adults who usually slept less than 6.5 hours ate around 270 fewer calories a day once they started sleeping longer.⁴
Try tonight
- Set your Sleep Goal. Aim for 7 hours or more on Sleepwave and notice how your energy and cravings shift over a few weeks.⁵
- Move bedtime earlier, gradually. Try going to bed 15 to 30 minutes earlier and build from there.
- Plan ahead after a short night. Cravings may be stronger after bad sleep, so have a satisfying meal or a healthier snack ready.
Cravings after a bad night are your body’s way of saying it needs rest. Give it the sleep it’s asking for, and your appetite may follow.
References
- National Heart, Lung, and Blood Institute. Sleep deprivation and deficiency: health effects. https://www.nhlbi.nih.gov/health/sleep-deprivation/health-effects
- Greer SM, Goldstein AN, Walker MP. The impact of sleep deprivation on food desire in the human brain. Nature Communications. 2013;4:2259. doi:10.1038/ncomms3259. https://doi.org/10.1038/ncomms3259
- Cappuccio FP, Taggart FM, Kandala NB, et al. Meta-analysis of short sleep duration and obesity in children and adults. Sleep. 2008;31(5):619–626. doi:10.1093/sleep/31.5.619. https://doi.org/10.1093/sleep/31.5.619
- Tasali E, Wroblewski K, Kahn E, Kilkus J, Schoeller DA. Effect of sleep extension on objectively assessed energy intake among adults with overweight in real-life settings: a randomized clinical trial. JAMA Internal Medicine. 2022;182(4):365–374. doi:10.1001/jamainternmed.2021.8098. https://doi.org/10.1001/jamainternmed.2021.8098
- Centers for Disease Control and Prevention. About sleep. Reviewed November 20, 2023. https://www.cdc.gov/sleep/about/index.html
