There is a close link between health and sleep. The vast majority of people need 7 to 9 hours of sleep to feel functional and active during the day. Poor sleep affects the immune system, heart, the endocrine system, memory and can cause attentional issues. If you have noticed it’s difficult for you to fall asleep, look at things that you are doing all day long. There is a high possibility that one of these ‘harmless’ habits is the reason you can’t sleep properly. Read on to find out what habits can cause sleep problems and how to deal with them.