Hi, it is known that stress can cause lack of sleep. You can consult a psychologist who will assess what is causing lack of sleep. A psychologist will help and guide you with ways to feel calm and get good sleep.

I used to be in this situation because of reasons below. Possible explanations: You might take a caffeine or a kind of stimulant that wakes you up. A tea for example is enough to not let you fall asleep. You might eat a dinner rich in carbohydrate. In summary it will give you energy that won’t help you fall asleep. Too long naps during the day. You take them because of a bad night and they disable to sleep well. You do sport activities too late. You use your phone, computer too late. The blue light from those devices are signs to produce less melatonin, the chemical that makes you feel sleepy. You take too many stimulant and they disable you to sleep well. You might be too stressed because of your long day. What you can do Stop napping. Find something that will help you unwind. Exhaust yourself with physical activities. Sleep everyday at the same time. This one is tough, but you need to be disciplined because if you weren’t that disturbed, you won’t post this question on quora. Light dinner. No stimulant. No blue light. Relax, in bed while waiting to fall asleep don’t worry too much about when you are going to sleep and for how much, just relax.

If the history of sleep disturbances is just 2 to 3 days no need to worry just try some deep breathing exercises, introduce a physical activity in your routine and set your biological clock i.e, keep one set time of waking and sleeping.If this won't help then you need to seek professional help