The Sleep Onset Latency Test was developed by a famous sleep researcher called Nathaniel Kleitman and is based on solid science. It helps you measure how sleep deprived are you?

Here’s how it works:  In the early afternoon, grab a spoon and head off to your darkened bedroom to take a nap. Place a metal tray on the floor beside your bed, and hold the spoon over the tray as you attempt to fall asleep.

Be sure to check the time as well. Next, when you inevitably fall asleep and the spoon crashes down onto the tray, waking you up, immediately check the time again and note how much time has passed.

Result: According to Professor Kleitman, if you fall asleep within five minutes of closing your eyes you are severely sleep deprived. If it took you 10 minutes to fall asleep, this is still a sign that you could use more sleep. If, however, you managed to stay awake for 15 minutes or more before falling asleep, you’re probably well rested. If you don’t happen to have a spoon and metal tray handy, you can still take this test by setting an alarm for 15 minutes to see if you fall asleep before it goes off.