It's a common problem, though not necessarily caused by anything negative. Emotional or physiological excitement can frequently lead to difficulties winding down in order to sleep.
Activating your body physically—with, say, a strenuous workout—within a few hours of trying to go to sleep can be a frequent source of difficulty. While regular exercise during the day is a very positive factor in sleep quality, exercising within one to two hours prior to bedtime can overstimulate your metabolism, releasing endorphins and raising your body temperature.
According to Johns Hopkins:
Aerobic exercise causes the body to release endorphins. These chemicals can create a level of activity in the brain that keeps some people awake. These individuals should exercise at least 1 to 2 hours before going to bed, giving endorphin levels time to wash out and “the brain time to wind down,” she says.
Exercise also raises your core body temperature. “The effect of exercise in some people is like taking a hot shower that wakes you up in the morning,” says Gamaldo. Elevation in core body temperature signals the body clock that it’s time to be awake. After about 30 to 90 minutes, the core body temperature starts to fall. The decline helps to facilitate sleepiness.
We've all experienced this. We're physically exhausted, but our mind is racing with plans, dreams, thoughts, ideas to the point that sleepiness remains a distant goal. We run through our plans for the next day, or—consciously or unconsciously—focus on trying to solve that tricky issue at work, or think about what ingredients to put in that batch of exotic vegan cupcakes we're planning to bake, or any of a nearly infinite palette of mental distractions that will keep sleep at bay. What to do?
There's no silver bullet to getting to sleep with a racing brain, but there are a few common recommendations:
Here are some more thoughts from the Amherst medical center: