Are you getting enough sleep? Here is a simple test. You'll need a spoon, a metal tray, and a stopwatch(the one in your smart phone is perfect.)
The metal tray gets placed on the floor below your hand holding the spoon. As you lay back on your bed you start your stop watch and position your spoon holding hand so it hovers just off the bed and over the tray. When you finally fall asleep the spoon will drop from your hand and hit the tray to clank and wake you. That's when you check your stop watch to see how long that took to happen.
15 minutes...you are ok
10 minutes...you have moderate sleep deprivation
5 minutes or less...saver sleep deprivation!
The idea is the faster you fall asleep the more your body has been craving it.