Hey. Try to think if something is bothering you. Stress often leads to difficulty with sleeping. If not, you may want to see if doing away with screen time/coffee/alcohol/exercise some time before bed helps you sleep better.
There could be many reasons for this; Physical or psychological.
How old are you?
Have you been going through any particular challenges recently?
I am 22 years old and haven't been through any particular challenges. It's just that all of a sudden I am having disturbed sleep, what should I do?