I had it with both tirz and reta. I'm still on the GLP1 and use medications for sleep now. I didn't have this with lower doses, only the higher doses. It doesn't seem to actually be a side effect of the medication itself, but a side effect of the changes that come from taking the meds: from the intarweb:
How Metabolic Changes May Influence Sleep[archived internal link]
While tirzepatide is not a sleep medicine, the metabolic changes it causes can affect sleep patterns—sometimes for the better, and sometimes with mild disturbances.
Stable Blood Sugar Levels:
Stable nighttime glucose levels can help prevent nocturnal hypoglycemia (low blood sugar while sleeping). Sudden drops in glucose can wake a person or cause restless sleep, sweating, or nightmares. By reducing these swings, tirzepatide may indirectly improve sleep continuity.
Reduced Inflammation and Better Energy Use:
Excess fat tissue can produce inflammatory chemicals that disrupt normal sleep rhythms. As body fat decreases, inflammation often falls, and the body’s internal clock (circadian rhythm) functions more smoothly. This may lead to deeper, more restorative sleep.
Improvement in Obstructive Sleep Apnea (OSA):
Many people with obesity have OSA—a condition where breathing repeatedly stops during sleep because extra tissue narrows the airway. Studies show that losing 10–20 percent of body weight can significantly reduce OSA severity. Tirzepatide-related weight loss can therefore lessen snoring, improve oxygen levels at night, and reduce daytime tiredness.
Hormonal Shifts That Affect Sleep and Appetite:
Weight loss changes levels of hormones like leptin and ghrelin. Leptin helps signal fullness, while ghrelin promotes hunger. As the body adjusts, temporary changes in these hormones can alter both appetite and sleep patterns—sometimes causing short-term insomnia or vivid dreams. Over weeks to months, these usually stabilize as the body reaches a new balance.
Digestive Changes and Sleep Comfort:
Because tirzepatide slows digestion, some people experience mild nausea or bloating, particularly soon after starting treatment or after dose increases. If injections are taken late in the day, this discomfort may affect sleep. Taking the dose earlier or eating smaller, lighter dinners can reduce this problem.
