All the morning people reading this post please raise your hand. What, none at all? Honestly, it’s not too surprising considering the number of us who wake up all groggy and grumpy in the morning and are nearly incommunicado until the coffee makes its way into our systems.  A decent night of sleep can take some edge off but to wake up chirping like a bird depends on when you wake up.

Prof Richard Wiseman explains the 90 minute rule in this video from In59Seconds. According to him, the key to waking up all charged up and hitting the ground running, is the 90 minute sleep cycle in which you wake up. Intriguing? Watch on to learn more!

Featured photo credit: In59Seconds via

Love this video?