Why do I sleep like a log in the winter and have insomnia in the summer? While there isn’t much research on this particular phenomenon, there is some evidence that seasonal changes can impact sleep patterns, and there are several issues that could cause you to lose sleep in the summer. Higher temperatures during the summer can also wreak havoc on sleep. This internal cooling effect helps us achieve the deep, restorative stage of sleep known as slow-wave sleep. But “when the ambient temperature is high outside, it prevents our body temperature from falling as quickly to where we want it to be in order to facilitate sleep,” Dr. Swanson said.

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Persons: Leslie Swanson, Dr, Swanson Organizations: University of Michigan