1. Sleeping late or irregularly is linked with our cardiovascular health issues like heart attack at early 20's or 30's, stroke and High BP etc. 

2. Insufficient sleep is directly linked with decline in cognitive function, it negatively impact on our memory, decision making skills and focus. 

3. Sleeping late night weakens our immune system, it makes our body prone to diseases and infections a lot. 

4. You'll feel more depressed, anxiety and mood swings or disorders if you sleep late at night.  

4. Late night sleep disturbs our hormonal balance which regulates the appetite, this results in more hunger and weight gain like issues. 

6. Sleeping irregularly elevates the level of cortisol levels, it is a stress hormone, and it can increase the stress levels in our body. 

7. Not having enough sleep can reduce the physical performance of athletes, it can result in slow reaction time, more injuries, low energy and low focus. 

8. Poor sleeping habit can result in imbalance of glucose and insulin sensitivity in our body which can increase the chance of getting type-2 diabetes like disease. 

9. Sleep deprivation can reduce your life span. As it overall negatively impacts our health and its functioning. 

10. At the last, it can recue the mental clarity, impacts our productivity, energy level and focus throughout the day.