Tired every morning when you wake up?
Mornings are the worst.
TFW your alarm goes off and you feel like you're suffocating at the bottom of a well and it'll take all day to climb out.
In the past, we put it down to the world being against us, but it turns out there's science involved.
Research shows that we sleep in 90-minute cycles, and so it's not the amount of sleep you get, it's what part of the cycle you wake up in that affects how you feel.
People typically go through 4-7 of these cycles each night, moving from light sleep at he beginning into a very deep sleep near the end.
And if your alarm rips you out of your sleep during that final stage: day ruined.
So, if you know when you need to wake up, you can work backwards using this free sleep calculator, to find the perfect time you should be going to bed.
Have a go, and see how it works for you. Tomorrow morning, you'll feel rested and ready to take on the world.
Or not, if you're this dog.