Because grinding happens often during sleep, most people are not aware that they are grinding their teeth. Many times people don't know that they grind their teeth and they learn that from their loved ones, from their spouse or kids.
The reason why we grind our teeth is more often the stress. But lately was discovered that irregular sleeping is one of the main causes of teeth grinding. It can be quite annoying and can also make your jaw feel stretched and tired when you wake up in the morning. Trying to relax and sleeping on time can help a lot, because when you don't sleep enough and you wake up early for a few days than you might start grinding your teeth, and sometimes you might even damage your teeth from the pressure.