We’ve all been there. You’ve been struggling to stay awake all day, warding off yawns with countless cups of coffee and unable to think of anything but hitting the hay.
But, the second you cosy down to catch forty winks, you’re wide-awake.
It turns out, that lying in bed unable to fall asleep is actually a disorder called conditioned or learned arousal and is considered one of the most common sleep problems.
So why does it happen?
According to sleep-medicine specialist Philip Gehrman, an assistant professor of psychiatry at the University of Pennsylvania, it’s because something in your sleep environment has signaled to