Insomnia is not one of the most commonly reported side effects in the main trials of Zepbound (tirzepatide) or Wegovy (semaglutide). The common ones are digestive: nausea, vomiting, diarrhea, constipation, reflux and stomach pain. Some people still sleep worse on these medications, usually because those stomach symptoms show up at night. If your sleep changed after you started or after a dose change, tell your prescriber.
What the prescribing information actually lists
Every prescription drug in the US comes with FDA prescribing information, the long document that lists the side effects seen in clinical trials. For tirzepatide and semaglutide, the most frequently reported reactions are digestive. Insomnia is not near the top of either list.
That does not mean nobody sleeps badly on them. It means that in large trials, sleeplessness was not one of the things that clearly showed up more often on the drug than on placebo. Trials average across thousands of people. You are one person, and if your nights changed, that is real information worth passing on.
It also helps to remember what else is going on. Many people start these medications during a period of real change: new eating habits, new exercise, weighing themselves often, thinking about food and their body more than usual. Any of that can stir up sleep on its own, separate from the drug.
Labels are updated over time, so the most accurate answer for your exact medication and dose comes from your pharmacist or prescriber, who can go through the current version with you.
Why sleep can get worse anyway
Most of the reasons are indirect. They come from what these medications do to eating and digestion.
- Nausea at night. Feeling queasy lying down is hard to sleep through, and many people notice it most in the days after an injection or a dose increase.
- Reflux. These drugs slow how fast the stomach empties. Lying flat with food still in the stomach can mean heartburn or a sour taste that wakes you.
- Hunger and meal timing. Some people eat very little during the day and then get hungry late, or go to bed hungry. Both can make it harder to settle.
- Not drinking enough. Eating less often means drinking less too. Dehydration, headaches and cramps do not help sleep.
- Bathroom trips. Diarrhea or a changed routine can bring you out of bed.
- Life changes around the medication. New exercise, worry about cost or supply, and big changes in how you eat and feel can all shift sleep.
One more thing is worth knowing. Losing weight can make snoring and sleep apnea better for some people, and tirzepatide is also approved for moderate to severe obstructive sleep apnea in adults with obesity. If you snore loudly or wake gasping, that is a separate conversation, and a good one to have. See sleep apnea vs insomnia.