Caffeine is widely known for its stimulating effects, but these same effects can also interfere with the quality of your sleep, especially if consumed late in the day. Research shows that caffeine can significantly reduce slow-wave (deep) sleep and limit REM (rapid eye movement) sleep—both essential stages for physical and mental restoration.
The Journal of Advances in Psychiatric Treatment highlights how caffeine not only delays the onset of sleep but also increases wakefulness throughout the night. This means that while you might feel more alert initially, excessive caffeine can actually lead to poorer sleep quality and, over time, even fatigue and mental fogginess.
If you’ve been struggling with sleep, try limiting caffeine intake in the afternoon and evening. This simple shift might help improve the quality of your restorative sleep, leaving you refreshed and energized the next day.