Introduction
Your body's tiredness-meter
Now that you've explored your body-clock, let's explore the other major player in sleep, your sleep drive.
Along with your body-clock, sleep drive is responsible for making it easier to fall asleep at the end of the day.
It is essntially your body's desire for sleep. The greater your sleep drive, the more likely you are to fall asleep.
If you do nothing else, your sleep drive will naturally build throughout the day, increasing with the total length of time you have been awake. Ideally, it will reach a peak that is high enough to make it easy to fall asleep when you want to (at the end of the day). If our sleep-drive is high at night, we will find it easier to both begin and maintain a deep sleep.
But, as you will see on the next page, your sleep drive can be affected by many daily activities . . .