On World Sleep Day, one cannot help remembering 'Early to bed, early to rise' proverb, which is something that most of us have grown up hearing, but this also has a scientific basis, which we probably did not understand back then. However, fifty years of research on brain activity and the patterns of sleeping is now triggering scientific discussions worldwide about what 'sleep' really means and what it is not. Considerable studies are taking place on identifying triggers that make it difficult for you to sleep soundly. Let's take a look at some of them: Light On World Sleep Day, you need to identify light as the most important external factor that directly impacts your sleep pattern, making it something that influencers your internal clock. Remember, when babies are put to sleep, 'lights off' is the unspoken rule. This is because we have light-sensitive cells in our retina, which conveys to the brain whether this is daytime or it is night time. According to what these cells convey, our sleep patterns are set. Studies indicate that exposure to light during sleep makes it next to impossible to sleep well. Jet lag Are you traveling or constantly on the move between places, flying in and out? On World Sleep Day, remind yourself that those who undergo jet lag as a result of traveling across time zones also suffer from insomnia. This is because they are usually awake at the time when their internal clock is conveying to them that they should fall asleep. Several news reports also suggest that a good number of professionals including police officials, nurses and others who tend to work during night hours also tend to fall asleep at work. For those who are conscious about leading a healthy and productive lifestyle, this is an important factor to consider while planning a work-related trip. Also Read: New approach may help fight TB effectively: Study Stressed out or depressed? A known fact that should serve as a gentle reminder on World Sleep Day is simply this: anyone who feels extremely stressed out, anxious or depressed is likely to get less sleep as the human body is programmed to stay alert during stress and it can make deep sleep difficult altogether. In general, all these factors play a role in limiting your sleep. Remember, the best thing you can do for yourself is to switch over to a regular pattern of sleep and monitor closely even the smallest changes to understand the triggers. Happy World Sleep Day to you!